Last June, a jury found Dominique Heaggan-Brown not guilty of first-degree reckless homicide. Thursday, he accepted a plea deal in an unrelated case.
A report following a nearly year-long investigation says the gunman also posted videos urging violence against police before he killed three officers and wounded three, and was himself shot to death.
Jurors couldn't agree on a verdict in the murder and manslaughter case against former police officer Ray Tensing over his fatal shooting of black motorist Sam DuBose in 2015.
Peter Liang, who is Chinese-American, was sentenced to probation for the shooting death of an unarmed black man. The ex-NYPD officer's case has sparked activism and debate among Asian-Americans.
The prosecutor, who had previously recommended Liang not serve any jail time, said the fatal shooting of Akai Gurley was "not police brutality." Liang's defense attorney called it a "tragic accident."