Sixteen-year-old Khalil Williams was shot and killed on the evening of February 17, 2012, while walking home with three friends near Orange Avenue and Orange Place in Irvington, New Jersey. As the youths ran, Brogsdale fired, and a single bullet struck Khalil in the back, killing him.

Investigators arrested multiple suspects. Marquise Hawkins, 20, of Newark, was identified as the person who stayed in the car and allegedly ordered the others to shoot; he was convicted by a jury in March 2015 of murder, felony murder, robbery, and conspiracy and later sentenced to 55 years. Azim Brogsdale, 16 at the time of the shooting, was convicted by a jury in January 2017 of murder, four counts of robbery, felony murder, and several weapons offenses; he faced a sentence of 30 years to life. A third man, Haroon Perry, 25, of Irvington, pleaded guilty to aggravated manslaughter and was expected to receive a 20-year sentence under a plea agreement. A fourth alleged co-conspirator was never identified or charged.

What information might help clarify who the unidentified fourth participant was or where he might be now?