What began as a group robbery ended in a homicide aboard a subway train. Prosecutors have provided a rare look into the district attorney’s decision not to charge a man in the fatal stabbing, saying surveillance video shows the victim acted in self-defense.

A homeless man with more than 50 prior arrests was charged Sunday with stabbing a man aboard a Lower Manhattan subway train on New Year’s Day, police said. Jamar Banks, 52, who resides in a Brooklyn homeless shelter,

You talking to me?” Jamar Banks asked before picking a fight and allegedly stabbing the cleaner in the back and armpit, the sources said.

The first day of the new year got off to a bloody start in Manhattan following two violent attacks in the city’s subway system, police confirmed Wednesday. The first stabbing occurred around 9:30 a.m.