"The victim was accosted, without provocation, and our investigation has shown that he defended himself while attempting to retrieve his property," the Queens DA said.

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 accused of fatally stabbing two people as he was being robbed on a 7 train will not be charged, Queens District Attorney Melinda Katz announced Wednesday. Instead, his alleged robbers,