A fourth Oakland police officer who was critically wounded after being shot by a man wanted on a parole violation has been taken off life support, a hospital spokeswoman said.

Spokeswoman Andrea Breaux of Alameda County Medical Center said Officer John Hege was taken off life support late Monday.

The 41-year-old officer's family had kept him alive so his organs could be donated.

Breaux said the process of harvesting the officer's organs started just after 8 p.m. and was completed by 2 a.m.

Police say Hege and a partner were gunned down Saturday by 26-year-old parolee Lovelle Mixon of Oakland, on Saturday as they stopped his 1995 Buick sedan.

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Two more officers were killed during an intense manhunt for the gunman when the city's SWAT team stormed an apartment.

Mixon was also killed.

The other slain officers were identified as Sgt. Mark Dunakin, 40, who was killed at the first shooting. The officers killed at the second location were Sgt. Ervin Romans, 43, and Sgt. Daniel Sakai, 35.

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The Associated Press contributed to this report.