A fourth Oakland, California, police officer has died as a result of shootings that happened Saturday, a police spokesman said Sunday. Sgt. Daniel Sakai, from left, Sgt. Mark Dunakin and Sgt. Ervin Romans were killed in the shootings. 1 of 3 John Hege, 41, was pronounced dead about noon Sunday at Highland Hospital.Hege was the fourth officer to die after a man being pulled over in a traffic stop opened fire and then battled SWAT officers at a nearby building Saturday, police said.The man who police said was the gunman -- Lovelle Mixon, 26, of Oakland -- was fatally shot in a gunbattle with SWAT officers in an apartment complex Saturday.Police said in a late-night news conference Saturday that Mixon had an extensive criminal history and was in violation of parole The incident began about 1 p.m. Saturday in east Oakland when two motorcycle officers tried to pull over a car for a "fairly routine traffic stop," said Dave Kozicki, the deputy police chief. Mar 22