When he was a senior at Western High School, Sibella was a busboy at the Stardust coffee shop and buffet. About to head to college at UNLV, the teenage Sibella lost a Datsun while gaining wisdom.

Roberts was best known for his roles in Allen's 1970s and '80s films Play It Again, Sam, Annie Hall, Stardust Memories, A Midsummer Night's Sex Comedy, Hannah and Her SIsters and Stardust Memories.