Conversation so far:
What was Rubin Carter's second conviction for?
During the new trial, Alfred Bello repeated his 1967 testimony, identifying Carter and Artis as the two armed men he had seen outside the Lafayette Grill.
What happen outside the Lafayette Grill?
murders happened.
How many people were murdered?
CANNOTANSWER.
How long was he sentenced to prison?
a double life sentence for Carter.

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