Manhattan District Attorney Alvin Bragg‘s office failed to confiscate a gun used in an armed robbery by a serial offender — who then fatally shot a man with that same weapon exactly a month later, a union boss alleged. Tyrell Rodgers, 29, allegedly pointed the silver revolver at his estranged girlfriend and stole her cell phone while threatening to kill her on Feb. 8, court records show. He then allegedly killed a man with that revolver on March 8 — after Bragg’s office failed to issue a warrant that detectives on the robbery case requested. “Why didn’t DA Bragg’s office...