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Lovelle Mixon, 26, of Oakland was killed in a gunbattle Saturday with Oakland police. (Contributed photo/Oakland Police Department)

Oakland — The parolee who killed four Oakland police officers last month took part in a Modesto home-invasion robbery with a friend a month before he killed the officers, Modesto police announced Thursday.

Lovelle Mixon, 26, and Cedric Daniels, 22, forced their way into a home Feb. 21, assaulting two occupants and running away with cash, jewelry and a rifle, Modesto police Sgt. Brian Findlen said in a statement.

Findlen refused to comment on the type of rifle stolen or if it had any connection to the rifle Mixon used to kill two Oakland police SWAT team members as they stormed an apartment in which Mixon was hiding.

Mixon's connection to the robbery came to light earlier this month after Oakland police received an anonymous tip about Mixon being involved in a robbery with a friend in Modesto. Oakland officials passed the information along to Modesto police, who already were investigating the robbery, which occurred about 9:45 p.m. Feb. 21.

The investigation led police to Daniels. He and Mixon were identified as the robbers by the two Modesto residents whose home was ransacked.

On Wednesday, Modesto police arrested Daniels on charges of robbery, home-invasion robbery, assault with a deadly weapon and armed robbery. Mixon would have been charged with the same had he still been alive, Findlen said.

Mixon was killed March 21 during a shootout with Oakland police after he already had killed four officers, two during a traffic stop and two during a SWAT raid on the apartment where he was hiding.

The four Oakland police officers killed were Sgts. Ervin Romans, 43, Daniel Sakai, 35, Mark Dunakin, 40, and Officer John Hege, 41.

Mixon's involvement in the Modesto home-invasion robbery matches the criminal history he had before he gunned down the officers. His criminal history began soon after he became an adult and included two terms in prison, once for assault with a firearm and once for violating probation.

Mixon also was suspected of killing a man in December 2007 and raping several women earlier this year.

Daniels, who law enforcement sources said was good friends with Mixon, remains in custody.