Conversation so far:
What was Rubin Carter's second conviction for?
After deliberating for almost nine hours, the jury again found Rubin Carter and John Artis guilty of the murders.
What happened outside the Lafayette Grill in 1966?
On June 17, 1966, at approximately 2:30 a.m., two men entered the Lafayette Bar and Grill at East 18th Street at Lafayette Street in Paterson, New Jersey, and began shooting.
How many people were murdered at the Lafayette Bar and Grill on June 17, 1966?
The bartender, James Oliver, and a customer, Fred Nauyoks, were killed immediately. A severely wounded customer, Hazel Tanis, died almost a month later.
How long was Rubin Carter sentenced to prison?
Judge Samuel Larner imposed two consecutive and one concurrent life sentence on Rubin Carter, and three concurrent life sentences on John Artis.

Question: When did his appeal begin?
Self-contained rewrite: When did Rubin Carter's appeal begin?