On a Sunday afternoon in March 2014, 17-year-old Antonio Joey Flores was shot and killed inside a friend’s apartment in the Spring Garden neighborhood of Philadelphia. Flores was among a group of friends on the 1600 block of Wallace Street when one of them produced a gun and fired a single shot that struck him in the head. He was taken to Hahnemann University Hospital and pronounced dead shortly afterward.

Investigators identified 23-year-old Sergio Santiago, described as Flores’ lifelong friend, as the primary suspect. A warrant was issued and Santiago was arrested three days later at the Neshaminy Inn. The motive was reported as unclear; Flores’ family said he had idolized Santiago and that their family had previously taken Santiago in when he had nowhere else to go.

In court proceedings reported through August 2015, Santiago pleaded guilty to third-degree murder and weapons charges and received a 15-to-30-year state prison sentence after admitting he produced a .38-caliber revolver and fired a shot that killed Flores. Was anyone in the Spring Garden neighborhood that day or who knew Antonio willing to share what they remember about the people who were with him?