Peter Robbins and Charlie Brown
John Gibbins/U-T San Diego/AP; AP
04/11/2013 at 08:00 AM EDT
Peter Robbins, who was the voice of Charlie Brown in many of the early animated Peanuts
specials, including A Charlie Brown Christmas
, pleaded guilty Wednesday in San Diego to making criminal threats and stalking following incidents involving his ex-girlfriend and her doctor.
He faces up to three years in prison at his sentencing next month, according to California's City News Service
Robbins, 56, reportedly paid for breast-augmentation surgery for his then-girlfriend, Shawna Kern. But after their relationship ended following an alleged domestic-violence episode, he threatened Kern and the doctor in an attempt to get his money back, prosecutors said.
He was arrested in January and had originally pleaded not guilty.
Robbins was 9 years old when he became the voice of Charlie Brown. His other TV specials included A Boy Named Charlie Brown
and It's the Great Pumpkin, Charlie Brown.