The judge reduced Liang's conviction shortly before the sentence was announced.
Akai Gurley was shot in November 2014 in the darkened stairwell of a housing project in East New York, Brooklyn.
Akai Gurley was shot by a stray bullet in a Brookyln stairwell.
Akai Gurley was shot in November 2014; officer Peter Liang says the gun went off by accident.
The officer's indictment comes amid calls for police reform.
NYPD officer Peter Liang faces a manslaughter charge for the November death of 28-year-old Akai Gurley, according to multiple reports.
The decision comes two days after a grand jury in the borough of Staten Island opted against charging a police officer in the chokehold death of an unarmed black man.