2026 Presentations
This presentation will focus on the behavioral analysis techniques used to assist the Westminster, CO Police Department in their 2012 investigation into the abduction of 10-year-old Jessica Ridgeway. It will specifically detail the on-scene behavioral analysis input provided to investigators of the abduction, homicide and dismemberment of Jessica. The presenter will discuss how these techniques assisted in narrowing the focus of the investigation, generated potential leads, formulated media strategies, interview strategies and assisted in the prosecution of the offender. The presentation will conclude with a dialogue, based on the post-offense behavioral interview of offender Austin Sigg, highlighting his pre-offense behavior, victim selection, and possible motives.
PRESENTED BY:
MARK L. MACKIZER, Special Agent - FBI Ret.
Mark retired after 27 years as a Special Agent with the Federal Bureau of Investigation where he spent most of his career conducting violent crime investigations. Mark held positions such as Crisis Management coordinator, Violent Gang Safe Streets Task Force coordinator, Evidence Response team member, and team leader for the FBI’s Southeast Region Child Abduction Rapid Deployment Team. The last 7 years of his career he was a Supervisory Special Agent assigned to the Behavioral Analysis Unit (BAU) where he was responsible for providing behaviorally based operational support to law enforcement involved in the investigation of violent crimes and threats.
Mark co-authored Crimes Against Children: Behavioral and Investigative Perspectives and the third edition of the FBI’s Child Abduction Response Plan.
Since retiring, Mark continues to provide operational behavioral analysis-based consulting services to government and private sector entities.
MARK L. MACKIZER, Special Agent - FBI Ret.
DETAILS COMING SOON...
PRESENTED BY:
JASON NEWLIN, CHIEF INVESTIGATOR Office of the State Attorney 2nd Judicial Circuit of Florida
CHIEF INVESTIGATOR OFFICE OF THE STATE ATTORNEY, 2 ND
JUDICIAL CIRCUIT
October 2020- current
INVESTIGATOR OFFICE OF THE STATE ATTORNEY, 2ND
JUDICIAL CIRCUIT
January 2010- October 2020
Investigate criminal cases within the prosecuting attorney’s office as in conjunction with the prosecuting attorney; conduct a wide variety of investigations, aid law enforcement in the initial investigation of crimes, prepare witnesses for trials, provide office security and related duties; prepare cases for preliminary hearings and trials; advise and collaborate with law enforcement agencies.
LIEUTENANT WAKULLA COUNTY SHERIFF’S OFFICE
June 2008- January 2010
Supervise the operations of investigative division within the department, setting goals for the unit, maintaining communication with other units, and assigning tasks to officers. Conducting investigations and arrests that led to successful prosecution.
DEPUTY WAKULLA COUNTY SHERIFF’S OFFICE
June 2006- June 2008
Performed routine patrols, interacted regularly with citizens, responded calls for service, conducted preliminary investigations, documented contacts and incidents through thorough report writing.
OFFICER FLORIDA FISH AND WILDLIFE CONSERVATION
COMMISSION
May 2003- June 2006
Patrolled, protected, and preserved the natural resources of the State of Florida through enforcement, education and communication.
JASON NEWLIN, Chief Investigator, Office of the State Attorney 2nd Circuit
GEORGIA CAPPLEMAN, ASSISTANT STATE ATTORNEY
Georgia Cappleman is a graduate of the Florida State University College of Law and has served as an Assistant State Attorney for 25 years. As Chief of Felony Division D and Administrative Chief, she maintains a felony caseload while supervising other attorneys and performing management duties including hiring and firing. She has conducted over 250 jury trials including death penalty cases and many cases involving violence against women and children. She is an adjunct professor at the Florida State University College of Law currently teaching Florida Criminal Procedure. She also coaches the FSU College of Law Mock Trial Team. Georgia is the 2024 recipient of the Eugene Berry Award; Attorney General’s Distinguished Victim Services Award (2012); Refuge House Advocate of the Year (2019); and Hon. Mention as Tallahassee Democrat Person of the Year (2019).
Georgia Cappleman, Assistant State Attorney
DETAILS COMING SOON...
PRESENTED BY:
Detective Alison Carpentier, Westchester County Department of Public Safety
Alison Carpentier is a retired Detective with the Westchester County Police Department, where she served for nearly three decades in a variety of investigative and operational roles. She began her career in 1988 as a patrol officer, spending nine years policing the highways of Westchester County before being promoted to Detective in 1997. As a detective, Alison worked undercover investigating narcotics operations and sex trafficking cases. She later served in the Major Crimes Unit, handling high-profile investigations, including homicide, organized crime, and child abuse throughout Westchester County. She was trained by the FBI as both an instructor and hostage negotiator, and spent more than 15 years on the Hostage Negotiation Team, responding to critical incidents and helping resolve dangerous situations safely. Over the course of her career, she received more than 25 commendations, including two life-saving awards. After retiring from law enforcement, Alison continued her investigative work with the New York State Attorney General's Office, where she investigated corruption in the City of Yonkers. She later concluded her investigative career at Citibank as the Assistant Vice President in the fraud department.
Alison Carpentier, Detective (Ret.), Westchester County Police Department
Detective Sergeant Terry Wilson, Rye Brook, NY Police Department
Historically, the City of Flint has been home to traditional gangs such as the Bloods, Crips, and Spanish Cobras, each with defined territories, membership, and rules. That landscape changed dramatically in 2021 following the killing of 16 year old Nicholas Collins, which was soon followed by the retaliatory killing of his rival, Tayveon Crowder. These homicides gave rise to two new gangs, “Nick Mafia” and “Tay Mafia.” Both have rapidly grown into dominant forces in Flint, significantly reducing the influence of the older gangs. Unlike their predecessors, Nick Mafia and Tay Mafia do not operate within fixed geographical boundaries. Their influence extends beyond Flint into surrounding communities and local high schools, and member allegiance is fluid, with individuals often switching sides.
Since 2021, approximately 32 homicides and countless felonious assaults have been attributed to the conflict between Nick Mafia and Tay Mafia. Investigations have also led to the confiscation of hundreds of firearms and thousands of dollars. Their criminal activities have forced us to adapt investigative techniques, patrol strategies, methods of gang member identification, and to increase engagement with local high schools and the prosecutor’s office.
During the presentation:
- D/Sgt. Sarah Combs, Flint’s local gang expert, will provide an overview of Nick Mafia and Tay Mafia. She will explain how their nontraditional structure has expanded into suburban communities, detail their “cash card” scheme that has generated millions of dollars nationwide, and discuss how a recent court ruling in Battle Creek, MI has impacted gang membership identification and the application of gang enhancement charges. Sgt. Combs has already presented this material numerous times to local judges, high school staff, neighboring police departments, and Flint patrol officers.
- D/Sgt. Donny Scott will present on the Tayveon Crowder (AKA “Tay”) homicide investigation which occurred on August 10, 2021. The killing of Tayveon Crowder is the origin story of Tay Mafia. Sgt. Scott took over the case after it remained unsolved for two years. He will outline his investigative methods, including extensive social media analysis, numerous interviews, phone search warrants, and dissection of rap videos. His investigation revealed that the suspect, Kiandre Cannon, was the nephew of a local assistant prosecuting attorney, Stephanie Cannon, who had been handling other Nick and Tay Mafia related cases. After Stephanie Cannon’s house was shot up where approximately 50 rounds were shot into her home, Sgt. Scott uncovered evidence that she had been aiding in concealing her nephew’s involvement in Crowder’s killing. Sgt. Scott also uncovered that Kiandre was paid for the homicide by a head member of Nick Mafia from funds gained through the cash card scam. Kiandre was charged with the homicide and ultimately took a plea deal. Sgt. Scott has presented this case once before at a local conference.
- D/Sgt. Lashabriane Kelly will present on the double homicide investigation involving 13 year old Dontavis Moore and 15 year old Dominque Ward. This case highlights the escalation of the ongoing gang conflict, the growing audacity of its members, and the victimization of innocent family members. Dontavis and Dominque were killed on June 26, 2024, when someone walked up to their basement window and fired nine rounds into the house. Also in the home was Dontavis’ older brother, Demidrick Moore, a known Tay Mafia member, as well as his mother and her boyfriend who were both unharmed. Demidrick was also unharmed and fled the scene prior to police arrival. Sgt. Kelly’s investigation revealed that the intended target was Demidrick, who was on social media “trolling” rival Nick Mafia gang members after a homicide that had occurred just eight hours prior in the neighboring jurisdiction of Mt. Morris Township. Through numerous interviews, listening to hours of jail calls, dissection of rap songs, and cell phone search warrants, Sgt. Kelly identified the suspect, Ryan Davis, and learned that he received detailed information through text messages from Demidrick’s ex-girlfriend. The text messages told Davis where Demidrick lived and exactly in the house where he would be hanging out. On July 11th, Ryan Davis was arrested at the funeral of the Mt. Morris Township homicide victim while in possession of a firearm. Ballistic testing confirmed it was the same weapon used in the killings of Dontavis and Dominque. Davis was charged with double homicide and is expected to enter a plea.
- Lieutenant Mark Boudreau – Before Sgt. Combs became our gang expert, I studied the active gangs at the time and gave a few presentations on them prior to the existence of Nick and Tay Mafia. I plan to provide a very brief historical overview of those groups, which will also serve as an introduction to the three sergeants and transition into Sgt. Combs’ presentation.
PRESENTED BY:
Detective Sergeant Donny Scott
Detective Sergeant Donny Scott was born and raised in Flint, Michigan, where he developed a deep commitment to public service and community safety. He began his law enforcement career with the Flint Police Department as a patrol officer, gaining firsthand experience in frontline policing before transitioning into Special Operations to focus on narcotics and firearms offenses. His dedication, investigative skill, and leadership led to his promotion to Detective Sergeant, and he currently serves as a homicide detective within the Major Crimes Unit. D/Sgt. Scott specializes in technology driven investigations and advanced digital forensics. He is trained and experienced in vehicle forensics (BERLA), mobile device forensics (Cellebrite), and cellular mapping analysis. His expertise allows him to integrate street level investigative knowledge with sophisticated forensic tools to support complex criminal and gang related investigations. Through this combination of field experience and technical proficiency, he plays a key role in identifying suspects, tracking criminal activity, and contributing to successful prosecutions. D/Sgt. Scott is a graduate of Eastern Michigan School of Staff & Command.
Donny Scott, Detective Sergeant, Flint Police Department
Detective Sergeant Sarah Combs
Sergeant Sarah Combs currently serves with the City of Flint Police Department, bringing extensive experience in Major Crimes, Intelligence, and homicide investigations. She previously worked as a homicide detective with the Major Crimes Unit (MCU) before transitioning into her current role as the Director of the Intelligence Bureau. She also serves as a Task Force Officer with the FBI Safe Streets Task Force. Sgt. Combs is deeply committed to understanding the gang related challenges facing Genesee County and to leveraging gang intelligence to support investigative and prosecutorial efforts. Over the past decade, she has applied her training and experience to raise awareness about gang activity and its impact on the community, working to inform both law enforcement partners and the public about the issues affecting Genesee County. Sgt. Combs is a graduate of Michigan State University.
Sarah Combs, Sergeant, Flint Police Department
Detective Sergeant Lashabriane Kelly
Detective Sergeant LaShabriane Kelly has served with the City of Flint Police Department for approximately six years. D/Sgt. Kelly established herself early in her career as a hard worker with valuable street knowledge. That hard work and dedication earned her a transfer to the Criminial Investigations Bureau as a detective assigned Major Crimes Unit (MCU). Her recent promotion to the rank of sergeant solidifies that hard work. D/Sgt. Kelly investigates serious and complex offenses, including homicides, assaults with intent to murder, felonious assaults, and criminal sexual conduct cases. D/Sgt. Kelly is dedicated to pursuing justice, supporting victims, and protecting the Flint community through thorough investigative work and strong collaboration with law enforcement partners. She is honored to serve as a guest speaker for the 2026 NHIA Conference.
LaShabriane Kelly, Detective Sergeant, Flint Police Department
Lieutenant Mark Boudreau
Lieutenant Mark Boudreau has been a member of the Flint Police Department since 2004 and is currently assigned to the Criminal Investigations Bureau, where he oversees the Major Case Unit, SAKI Unit, and Youth Services Bureau. Lieutenant Boudreau was promoted to the rank of lieutenant in 2014 and has served as a shift commander in the Patrol Operations Bureau, as well as commanding the Crime Area Target Team (CATT Squad). He also serves as the Flint Police Department's lead crisis negotiator. Lieutenant Boudreau earned his Bachelor of Arts from John Jay College of Criminal Justice in New York City and is also a graduate of the Michigan State University School of Staff & Command. He has been an Advisory Member with the NHIA since 2023.
Mark Boudreau, Lieutenant, Flint Police Department
In the first presentation, Dr. Collins will discuss the various psychological motivations behind dismemberment. He will also provide case studies of homicides that involved criminal dismemberment, including those committed by serial offenders, with whom he has been consulted.
The second presentation will explore sexual homicide and
the cross-associated sexual deviances that one can find
in these cases. Multiple case examples to be discussed.
PRESENTED BY:
DR. PETER COLLINS, CD, MD, MCA, FRCP(C), CTAP(C)
Dr. Peter I. Collins is a Canadian forensic psychiatrist and internationally recognized authority on violent crime, threat assessment, and crisis negotiation.
Professional Roles
- Operational Forensic Psychiatrist, Security Section, Intelligence Services (2025 to present), Toronto Police Service
- Former Operational Forensic Psychiatrist (1995–2025), Ontario Provincial Police
- Former member, first profiling unit, Violent Crime Analysis Section (1990-1995), Royal Canadian Mounted Police
- Contributed to the development of the Violent Crime Linkage Analysis System (ViCLAS)
- Member (since 1992), Crisis/Hostage Negotiation Team, Toronto Police Service Emergency Task Force
Education & Academic Appointments
- Master’s degree (MCA) in Applied Criminology – University of Ottawa
- Medical Degree (MD) – McMaster University
- Postgraduate training in Psychiatry and Forensic Psychiatry – University of Toronto
- Clinical appointment: Complex Care and Recovery Program, Centre for Addiction and Mental Health
- Associate Professor, Division of Forensic Psychiatry, Temerty Faculty of Medicine, University of Toronto
Professional Credentials & Editorial Work
- Certified Threat Assessment Professional (Canada)
- Consulting Editor, Journal of Threat Assessment and Management (published by the American Psychological Association)
Military Service & Honours
- Retired Lieutenant-Commander, Canadian Armed Forces (Reserves)
- Two deployments in Southern Afghanistan
- Recipient of:
- General Service Star for South-West Asia (2009)
- Queen’s Diamond Jubilee Medal (2012)
- Minister of Veterans Affairs Commendation (2024)
- King Charles III Coronation Medal (2025)
Awards & Distinctions
- Elected (1997) to the International Criminal Investigative Analysis Fellowship
- Hal Lipset “Truth in Action” Award (2015) – World Association of Detectives
- Career Achievement Award (August 2025) – International Homicide Investigators Association
- Lifetime Achievement Award (October 2025) – Canadian Association of Threat Assessment Professionals
- Inaugural recipient of the Dr. Peter Collins Excellence in Crisis Negotiation Award (November 2025) – Ontario Police Crisis Negotiators
International Work
Dr. Collins has worked with and instructed criminal justice and security agencies across North America and in 26 countries internationally, including:
- Federal Bureau of Investigation (FBI)
- INTERPOL
- EUROPOL
He is widely regarded as an expert in violent crime analysis, threat assessment, and crisis negotiation.
Dr. Peter Collins, CD, MD, MCA, FRCP(C), CTAP(C)
This lecture will cover the investigative methods and
processes used during the investigation into the
quadruple homicide that occurred in Moscow, Idaho, on
November 13, 2022. The presentation will outline the
steps taken from the initial response through the
identification of the suspect and will highlight the
extensive multidisciplinary coordination and teamwork
required throughout the case. This investigation drew
significant national and international attention, creating
unique challenges for law enforcement as the case
progressed. The presentation will discuss the involvement
of local, state, and federal resources, the use of forensic,
analytical, and technical investigative techniques, and the
process that ultimately led to the identification and arrest
of the individual responsible nearly seven weeks after the
killings.
PRESENTED BY:
DARREN M. GILBERTSON, LIEUTENANT - IDAHO STATE POLICE
Darren has been a member of the Idaho State Police since 2003 and is currently assigned to the Investigations Division, where he oversees the District 2, Idaho State Police Investigations district. He has served as a Detective, Sergeant, and Lieutenant within investigations since 2012. Before this, he worked as a Trooper, where he served as a Field Training Officer, TAC Officer, and member of the Idaho State Police Honor Guard. Prior to joining the Idaho State Police, he served in the United States Marine Corps, serving on active duty from 1993 through 1997 and then with the United States Marine Corps Reserve from 1998 until his retirement in 2022.
