A homeless man who fatally stabbed one of several assailants who tried to rob him on a 7 train in Queens last month won’t be charged—but the surviving men who tried to rob him will be, prosecutors announced Wednesday.

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.

Dramatic video footage captured the moment a 69-year-old homeless man stabbed the thugs who mercilessly terrorized him on a Queens subway train, killing one and wounding another. In a twist of transit justice,