Man Who Beat Wife With Child's Guitar Sentenced: Sonoma County DA

SONOMA COUNTY, CA — A man on trial for beating his wife with a child-sized electric guitar inside the family's home was sentenced Wednesday after a jury convicted him of felony domestic violence.

Arnulfo Favian Montes-Medina, 38, of Santa Rosa, was sentenced to a year in county jail and four years of formal probation.

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He also convicted of personally using a deadly weapon and personally inflicting great bodily injury during the 2025 assault on his wife.

The violent felony conviction counts as a strike under California law. Judge Lynnette Brown sentenced Montes-Medina maximum county jail term available under the circumstances, according to the Sonoma County District Attorney's Office.

The conviction stems from an Oct. 5, 2025, attack inside the Santa Rosa home Montes-Medina shared with his wife and at least three of their five children.

During multiple frantic 911 calls, the victim pleaded for police and medical help, telling dispatchers Montes-Medina had "literally beat me with a guitar."

Santa Rosa police officers arrived to find the victim crying, unable to walk, suffering from a deep cut to her foot, and surrounded by blood.

Prosecutors said Montes-Medina repeatedly struck her with a child-sized electric guitar. The victim later required hospital treatment, including five stitches for the foot injury.

After the assault, Montes-Medina barricaded himself inside the home's detached garage for about 90 minutes before surrendering to officers.

Although the victim later declined to cooperate with prosecutors, jurors heard testimony explaining that domestic violence victims often face complicated circumstances, including fear, financial dependence, hopes an abuser will change, or concerns involving child custody.

Prosecutors argued that the attack was not an isolated incident. The victim's mother told jurors she had witnessed Montes-Medina assault her daughter on previous occasions and described a home where "the police were always at the house," portraying what prosecutors argued was an ongoing pattern of abuse.

District Attorney Carla Rodriguez said the case demonstrated why prosecutors continue pursuing domestic violence cases even when victims later withdraw their participation.

"Domestic violence is uniquely dangerous because it often escalates behind closed doors and frequently involves victims who later recant or ask that charges be dropped," Rodriguez said. "A victim's willingness to participate in court is one piece of evidence. It is not the measure of whether a crime occurred."

Although Montes-Medina had no prior criminal convictions, the violent felony conviction counts as a strike under California's Three Strikes law, exposing him to enhanced penalties if he commits future felony offenses.

In addition to jail and probation, Judge Brown ordered Montes-Medina to complete a 52-week certified batterer's intervention program, perform community service, maintain employment or education, and submit to random drug and alcohol testing.

While imposing the sentence, Brown said the case was "of serious concern" because of the violence and the lasting impact on the family.

"You have children that are watching what is happening and they will mimic this cycle in their future relationships unless this cycle ends," Brown told Montes-Medina.