William Bratton , late Thursday , was shot after entering a stairwell in Staten Island with girlfriend . A rookie police officer `` accidentally discharged '' his weapon , police say . Police Commissioner Ken Thompson calls victim a `` total innocent '' Brooklyn D.A . William Bratton says shooting is `` deeply troubling ''
Akai Gurley , 28 , was shot after entering a stairwell in Brooklyn with girlfriend . A rookie police officer `` accidentally discharged '' his weapon , police say . Police Commissioner William Bratton calls victim a `` total innocent '' Brooklyn D.A . Ken Thompson says shooting is `` deeply troubling ''