Accused Girl Slayer Visited by ParentsARRAIGNED on a first-degree murder charge yesterday in Santa Ana, Billy Rupp, 18. stared straight ahead as details o! the sex slaying of pretty Ruby Atm Payne were read to the court. Although his blue eyes were co-id and impassive, the youth's legs and chest shuddered uncontrollably.GRIM-FACED, Mr. and Mrs. William F, Rupp Sr., enter the Orange County Jail in Santa Ana for a brief reunion with their son, Billy Rupp. Mr. and Mrs. Rupp were allowed to talk with Billy for 50 minutes. mom*J