Voice actor Peter Robbins and Charlie Brown attend Warner Home Video's DVD Release of "You're Not Elected, Charlie Brown" October 7, 2008 in Hollywood, California.
Valerie Macon—Getty Images
November 11, 2015 6:04 PM EST

A 59-year-old man who voiced Charlie Brown in multiple “Peanuts” television specials pleaded guilty Tuesday to threatening to hire a hitman to kill the San Diego County sheriff.

Prosecutors said Peter Robbins offered money to have Sheriff Bill Gore murdered, according to the Los Angeles Times. He also pleaded guilty to threatening the manager of a mobile home park in an unrelated incident.

Robbins told the court that he suffers from bipolar disorder and paranoid schizophrenia.

“I’m mentally ill,” he said. “I’ve committed no crime.”

Robbins could be sentenced up to four years and eight months in prison when he appears before a judge again Dec. 7.

This is not Robbins’ first offense, as he was placed on probation in 2013 after pleading guilty to threatening a former girlfriend and the surgeon who did her breast augmentation.

He later served four months in jail for a probation violation, among them failure to finish a domestic violence class and cutting off his GPS-enabled ankle monitor.

According to the Times, when arrested, Robbins was living with his dog named Snoopy.

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