A 15-year-old boy was arrested for killing a 17-year-old girl in a car in Queens, cops said Sunday.

Shantasia O’Brian was shot in the back around 5 p.m. Friday while in front of 240-06 136 Ave. near Brookville Boulevard in Rosedale, cops said.

Cops arrested the 15-year-old suspected shooter Saturday and charged him with manslaughter, criminal possession of a weapon in the second degree and tampering with physical evidence, cops said. His name wasn’t released because he’s a juvenile, police said.

Police were unable to say if the shooting was accidental or intended.

EMS transported Shantasia to Jamaica Hospital, where she was declared dead, cops said.