Sonoma County Supervisor Efren Carrillo was arrested early Saturday on suspicion of prowling and burglarizing a woman's house in Santa Rosa, police said.

Carrillo, 32, a Santa Rosa resident who has been in office since 2008, was arrested after he allegedly attempted to climb in a bedroom window at a home near the intersection of Stony Point Road and West 3rd Street, said Sgt. Terry Anderson of the Santa Rosa police.

Officers who arrived on scene found Carrillo carrying a cell phone and clad in nothing more than underwear and socks, police said. He was detained and booked at Sonoma County Jail.

Carrillo, who was released from jail on $40,000 bail at noon Saturday, said he had been drinking at the time of the incident.

"I realize that my behavior was embarrassing," he told The Chronicle in an e-mail. "It involved alcohol and I'm taking immediate steps to seek professional help."

The woman called the police around 3:40 a.m. to say she'd woken up to the sound of her bedroom window blinds being moved, police said. Investigators would later find that her window screen had been torn open, with an opening apparently wide enough to let someone reach through and open the window.

As police officers headed to the scene, the woman called again to say someone had knocked at the front door, identified himself as a neighbor and run away, police said.

The woman told a detective she had spoken informally to Carrillo several times around the neighborhood more than a month ago.

This isn't Carrillo's first brush with the law. Last September, he was arrested in San Diego after a 2 a.m. fight outside a nightclub in the city's popular Gaslight District that left a man unconscious. He told police that he stepped in to protect some women in his group who were being harassed.

He was initially jailed on suspicion of felony battery, but his case was later deemed a misdemeanor. All charges were later dropped because of what a lawyer for the San Diego city attorney's office said were "conflicting accounts of what occurred."

When Carrillo was first elected to office in 2008 at age 27, he was the second-youngest supervisor ever elected in the county. He was re-elected last year as supervisor of the county's Fifth District, which includes the county coast, the lower Russian River area, Sebastopol and west and southwest Santa Rosa.
