The “knockout game” involved groups of racist black youths sucker punching an unsuspecting white person.

ST. LOUIS, MO. (KTVI) – The teenager shot and killed by a homeowner while allegedly breaking into the man’s house had been in the news before.  In fact, FOX2 has learned, he was once charged in the case that made the phrase “knockout game” common in St. Louis.

Demetrius Murphy, 15, died Friday morning after he and another teen, Michael Bryant, allegedly tried to break into a man’s home on Tennessee.  Police say the homeowner emerged with a gun.  Bryant ran, but they say Murphy confronted him and was shot and killed.

When it happened, the ears of Matt Quain perked up.  It was back in 2011 that Quain and a friend were walking along Grand, returning from a “beer run” to Schnucks, when they say a group of teens jumped them.   Quain was beaten badly, suffering neck injuries and a broken jaw.  He was discovered bleeding in the street by Mayor Francis Slay and his security guard.

Murphy, just thirteen at the time, was the one identified by Quain as his attacker.  Sources tell Fox 2 that Murphy was headed to trial in the “knockout game” case, but a young witness suddenly refused to testify, forcing the charges to be dropped.