New HampshireDepartment of JusticeOffice of the Attorney General

About the Unit

In the past 40 years there have been approximately 120 homicide victims whose killers have not yet been brought to justice.

On July 29, 2009, Governor John Lynch signed into law HB 690, establishing for the first time in the state's history a Cold Case Unit assigned to work exclusively on unsolved murder cases. The New Hampshire Attorney General is the chief law enforcement officer for the state with exclusive jurisdiction over homicide cases. Most of the state's homicides are investigated by the New Hampshire State Police Major Crime Unit. However larger cities, such Concord, Dover, Keene, Manchester, Nashua, and Portsmouth, investigate homicides occurring within their jurisdictions.

The Cold Case Unit was organized in the Fall of 2009 to combine the experience of the Attorney General's Office, the Major Crime Unit, and a city detective. The Unit is staffed with a prosecutor and three detectives who will focus on reviewing unsolved homicides, unresolved suspicious deaths, and missing person cases in which foul play is suspected in the person's disappearance.


  • Sergeant Michael Kokoski has been a member of the NH State Police Major Crime Unit since 2008 and has worked on a multitude of active and historic homicides in his career. He was assigned to the Cold Case Unit in 2010, and since that time has been a contributing member to the CCU'S successful case resolutions.
  • Trooper First Class Richard Perreault has been a Trooper with the state of New Hampshire since 2008. His prior law enforcement experience was for the Town of Rollinsford as a Patrol Officer from 1990-1993. TFC Perreault was assigned to the Major Crime Unit in 2015 and he has been involved in numerous homicide investigations, to include both current and cold cases.
  • Charles West is a retired New Hampshire State Police Lieutenant with over 30 years of law enforcement experience. At the time of his retirement, he commanded the State Police Major Crime Unit and is currently assigned as a part-time investigator with the Attorney General's Office.
  • Tracey Flaherty joined the Major Crime Unit in March 2016 as its first Cold Case Analyst. Tracey has worked in the field of Intelligence Analysis for more than 20 years, beginning with the FBI in 1994. During Ms. Flaherty's analytical career she provided tactical and strategic investigative analysis for a variety of initiatives within the FBI. Throughout her career with the FBI, Ms. Flaherty has partnered with local, state and federal law enforcement agencies.
  • Susan Morrell is a Senior Assistant Attorney General with over 30 years of prosecution experience. Susan has been assigned to the Homicide Unit of the Criminal Bureau for the past nine years. She was previously assigned to the Drug Prosecution Unit of the Criminal Bureau for 13 years. Her experience also includes serving as a Special Assistant United States Attorney in the District of New Hampshire, as an Assistant and Deputy Strafford County Attorney and as the Assistant and Acting City Attorney in Keene, New Hampshire.
  • Joelle Donnelly Wiggin is an advocate with the New Hampshire Office of Victim and Witness Assistance. She has been assigned as the advocate for the Cold Case Unit since its start. As an advocate for the New Hampshire Office of Victim and Witness Assistance, she responds to homicide cases around the state to work with the families who have lost their loved one, as well as witnesses in the case. Ms. Donnelly Wiggin obtained her BS from the University of New Haven and recently achieved a Master Degree in Public Administration with a concentration in Criminal Justice from the University of North Carolina at Pembroke.

If members of the public have any information about any of the unsolved homicides in this state, they are encouraged to use the tip form to provide information to the investigators. The following is a list of cases under review by the Cold Case Unit.

New Hampshire Department of Justice
33 Capitol Street | Concord, NH | 03301
Telephone: 603-271-3658