Oakland police department spokesman Jeff Thomason said 41-year-old Officer John Hege was pronounced brain dead but was still on life support Sunday afternoon.
Thomason said that a final decision was still being made about donating Hege's organs.
Authorities say a 26-year-old parolee opened fire on Hege and 40-year-old Sgt. Mark Dunakin after they pulled him over on Saturday, killing Dunakin.
Suspect Lovelle Mixon was slain later that afternoon in a gunfight with police that left two more officers dead.
Thomason identified those officers as 43-year-old Sgt. Ervin Romans and 35-year-old Sgt. Daniel Sakai.
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