Steven Petrilli, 24, has already been sentenced to life in prison without the possibility of parole for the July 26, 2006 killing of San Francisco Police Department Officer Nick-Tomasito Birco.

Petrilli had been fleeing police in a stolen van after committing four robberies in The City when he struck Birco’s patrol car. Birco was pronounced dead at the hospital a short time later.

But there was still a lot of concern about his two accomplices in the robberies that night, Carl Lather and Nicholas Smith.

On Friday, the two pleaded guilty to manslaughter and robbery in a plea deal that should result in a 15-year sentence, the San Francisco District Attorney’s Office announced.

Sentencing is scheduled for May 6 in San Francisco Superior Court.