Police said Collin confessed to officers arriving on the scene that he was responsible for the slaying.
Autopsy results listed Devera's official cause of death as "blunt force" and a "sharp force injury" to the head.
Collin has been linked to previous cases.
In 1986, he fatally shot his younger brother, 32-year-old Tim Collin on Halloween night. The incident was ruled an accident by the Contra Costa County Sheriff's Office and never forwarded to the district attorney's office, according to Knox.
And in 2006, Collin was sentenced to probation after he pleaded no contest to misdemeanor domestic battery charges involving Devera, according to prosecutors.
Collins' arraignment was set for Oct. 8, Knox said.