(NEWSER) - The man responsible for the deaths of four Oakland police officers over the weekend had an extensive criminal history, the Tribune reports. Lovelle Mixon, 26, spent 5 years in prison for a 2002 assault with a firearm. After he was paroled, he was a suspect in a 2007 murder; though police couldn’t make the case, he was sent back to prison for parole violations. More»