Former Pryor Cashman associate Colinford Mattis was sentenced to a year and a day in federal prison Thursday, two and a half years after he was arrested and charged with firebombing an unoccupied New York City Police Department vehicle during protests for racial justice in Brooklyn.

Mattis and his co-defendant, former tenants’ attorney Urooj Rahman, pleaded guilty in June to conspiracy to commit arson and to make and possess an unregistered destructive device. Rahman was sentenced to 15 months in prison in November.