Peter Robbins is scheduled to appear in San Diego Superior Court on Wednesday for sentencing. He pleaded guilty last month.
Prosecutors say the 56-year-old called his former girlfriend up to 37 times in a 24-hour period, saying he would kill her and her son if she did not give back his dog and car. They say Robbins repeatedly called the plastic surgeon to demand a refund for the breast enhancement.
The Oceanside resident is best known for his portrayal of Charlie Brown on the TV special "A Charlie Brown Christmas."