The doctor shot dead by a deranged former Bronx-Lebanon Hospital worker was covering someone else's shift.
Dr. Tracy Tam, of Queens, died in a reign of terror unleashed Friday by Henry Bello, who stormed onto the building's 16th floor in a white lab coat, carrying an AM-15 rifle and jars of gasoline.
Bello resigned in 2015 amid a sexual harassment scandal, but vowed to return and kill a coworker.
Tam was not Bello’s intended target, and Friday was supposed to be her day off. She took the shift to cover for a coworker, according to a hospital source.