Evens Archer was 17 when he was shot at a South End party in Boston on June 29, 2014. A Dorchester resident and East Boston High School student, Archer was described as a gifted basketball player who wanted to attend Morehouse College. He was shot once in the back of the head at about 1:50 a.m.; he survived for three weeks but later died of his injuries.

Security camera footage did not capture the shooting itself but showed the gunman fleeing. Investigators found the firearm beneath a sewer grate near where the man was seen crouching; ballistic testing linked that gun to the fatal shot. The man accused in the killing, 22-year-old Johnnie Bonnie of Jamaica Plain, was indicted November 14, 2014, and later pleaded guilty to voluntary manslaughter, receiving a 20-year prison sentence.

Did anyone at the party or nearby that night see something that hasn’t been reported?