The pastor at Mission Hills Church says he found evidence of a break-in Monday morning. There were books and CDs strewn about, white powder on the floors and missing boards from a previously broken window.
When deputies arrived, they found Jason "Mayhem" Miller sitting naked on a couch. They also found evidence that Miller had set off fire extinguishers inside the church, sheriff's spokesman Jim Amormino said. Miller was coherent and cooperated with authorities upon arrest.
He's being held on $20,000 bail and is due in court Wednesday.
Miller has fought for several organizations, including UFC. He also hosted the MTV reality show "Bully Beatdown," where bullies take on professional MMA fighters for a cash prize.
Before his last fight on May 27, Miller said he would retire if he was defeated. He went on to lose a lackluster decision to C.B. Dollaway
The Associated Press contributed to this report.