Ezra's Shooter is a character who first appears in "A is for Answers". After The Liars reunited with Alison in New York City, Shana followed them and tried to shoot them with a gun, but Ezra appeared and was shot instead.
Shana tried to finish the job at the Fitzgerald Theatre, but Aria surprises her and hits her with a shotgun. It caused her to fall off the stage into the orchestra pit to her death.