LOS ANGELES, Dec 12 (Reuters) - The debate over the imminent execution of Stanley Tookie Williams hinges partly on his claim that he founded the notorious Crips street gang -- then renounced a criminal life in a quest for redemption. Though Williams, who is scheduled to die on Tuesday, maintains his innocence in the four 1979 murders that landed him on death row, he takes credit for founding the Crips a decade earlier with another teenager, Raymond Washington, and says he now regrets his role. Prosecutors question the 51-year-old Williams' sincerity in repudiating the Crips. Experts say the convicted killer...