Los Angeles ( CNN ) -- Peter Robbins was a child when he provided the iconic voice for Charlie Brown , still heard every year when the classic 1960s television movies are rebroadcast . Today , Robbins is in the San Diego County jail , inmate No . 13704837 , charged with 12 felony counts of making criminal threats and stalking , authorities said . Robbins , 56 , of Oceanside , California , pleaded not guilty Wednesday to the charges in San Diego County Superior Court , said District Attorney Bonnie Dumanis . Robbins is facing up to nine years in state prison for stalking his ex-girlfriend and making criminal threats against a La Jolla plastic surgeon , the prosecutor said . San Diego Superior Court Judge David Szumowski set Robbins ' bail at $ 550,000 , and he was ordered to have no contact with the two people involved in the case and not to possess a gun , Dumanis said . A readiness hearing for Robbins has been set for February 22 and a preliminary hearing has been scheduled for March 22 . When heroes disappoint our kids . Border Patrol agents arrested Robbins late Sunday as he entered the United States from Mexico at the San Ysidro , California , port of entry , according to a U.S. Customs and Border Protection spokesman . A computer check of his passport revealed that Robbins , who was driving into the country alone in a 2006 Mercedes , was wanted in San Diego on a felony warrant , Customs spokesman Ralph DeSio said . Robbins acknowledged to police that he is the same Peter Robbins who was the child actor , San Diego Police spokesman Gary Hassen said . The four counts of threatening death and one stalking charge involve four victims , including a San Diego Police sergeant . Robbins allegedly threatened the officer with bodily harm during a January 13 incident , Hassen said . Police in Oceanside and Carlsbad , California , are also investigating incidents there , Hassan said . CNN was unable to contact Robbins or a representative for comment . Robbins was 9 in 1965 when he was cast as Charlie Brown in the animated `` A Boy Named Charlie Brown . '' `` A Charlie Brown Christmas '' was produced later that year , using Robbins as the lead voice . Other TV movies using Robbins ' voice include `` Charlie Brown 's All Stars ! '' `` It 's the Great Pumpkin , Charlie Brown , '' `` You 're in Love , Charlie Brown '' and `` He 's Your Dog , Charlie Brown . '' His last role as Charlie Brown -- `` It Was a Short Summer , Charlie Brown '' -- was produced when Robbins was 13 . He told an interviewer in 2008 that he was replaced when his voice changed too much after he turned 14 . Robbins ' on-camera acting career included featured roles in episodes of TV 's `` Rawhide , '' `` The Munsters , '' `` F Troop '' and `` Get Smart . '' Robbins ' last acting role was in a 1972 episode of `` My Three Sons , '' according to the Internet Movie Database . He grew up to become a California real estate agent , living in Oceanside with his dog , Snoopy , his official biography said . CNN 's Michael Martinez and Carolyn Sung contributed to this report .
NEW : Peter Robbins , 56 , is charged with 12 felony counts of making threats and stalking . NEW : He is ordered to stay away from his ex-girlfriend and a Mexico plastic surgeon . Hassen agents arrested Robbins late Sunday as he entered the U.S. from Mexico . Charlie Brown was 9 in 1965 when he voiced Robbins in the animated TV movies .