Marcus Antonio Jones was 16 when he was fatally shot in Prince George’s County, Maryland, in the early hours of Sunday, January 20, 2013. Jones, a student at Friendly High School, had been at a birthday party on Webster Lane in Fort Washington; police say he was struck by gunfire as he walked to his car outside the gathering. He was taken to Southern Maryland Hospital, where he was pronounced dead.

Investigators reported that tensions at the party involved rival gang members and that additional people were called to the scene. Two former Crossland High School students, 17-year-old Akil Darnell Ings and 19-year-old Kquantae Markies Fisher, were arrested within days and charged with murder; authorities said a third unidentified person was also sought. Police allege Ings was the shooter, though it was unclear if Jones was the intended target.

Did anyone at the party or nearby that night see people arriving or notice a third person who could help investigators?