Cole Kinney, a 17-year-old aspiring boxer from Lowell, Massachusetts, was fatally shot on July 20, 2016, on North Shore Road in Derry, New Hampshire. Police found Kinney with a single gunshot wound to the chest just before 11:30 p.m.; he died at the scene and the New Hampshire Chief Medical Examiner ruled the death a homicide.

Investigators say the shooting followed a pre-arranged confrontation tied to a dispute involving another person. According to the inquiry, Kinney and a group of friends drove to 21-year-old Devin Rios’s home, an altercation occurred, and Rios—who was armed with a handgun—fired the shot that killed Kinney. Rios cooperated with the investigation and claimed he acted in self-defense.

After review, the New Hampshire Attorney General’s Office concluded Rios’s account was credible and determined the shooting was justified under state self-defense law; no criminal charges were filed and the case was closed. Does anyone have information about the events that led up to that night or knew Cole Kinney?