Peter Robbins, the original voice of Charlie Brown, could face up to three years in prison after pleading guilty Wednesday to threatening and stalking his ex-girlfriend as well as the plastic surgeon who gave her the breast enhancement he paid for. (Obligatory "Good grief!" goes here.)

The 56-year-old Robbins was arrested in January on an outstanding warrant while returning to California from Mexico, and arraigned on four felony counts of making a threat to cause bodily harm or great bodily injury and one count of stalking. According to City News Service (via The Associated Press), prosecutors say Robbins called his former girlfriend a dozen times a day and threatened to kill her and her son if she didn't return his car and dog. He allegedly also threatened her plastic surgeon, demanding a refund for the breast enhancement.

Robbins was just 9 years old when he was cast to voice Charles M. Schulz’s round-headed kid for the 1965 television special A Charlie Brown Christmas. He reprised that role in five more specials, including It’s the Great Pumpkin, Charlie Brown and Charlie Brown All-Stars and in the 1969 feature film A Boy Named Charlie Brown. He appeared in his final Peanuts animated project, 1969′s It Was a Short Summer, Charlie Brown, at age 13; after that, his voice changed. Still, Robbins outlasted the rest of the original cast.

Now a real-estate agent, Robbins reunited with fellow Peanuts cast members and director Bill Mendleson in 2008 at Comic-Con International