Many people who knew Liston insisted he was afraid of needles and never would have used heroin. "He had a deadly fear of needles," said Davey Pearl, a boxing referee and friend of Liston's. "There was nothing Sonny feared more than a needle. I know!" said Liston's Philadelphia dentist, Dr. Nick Ragni. "He was afraid of needles," echoed Father Edward Murphy. "He would do everything to avoid taking shots." According to Liston's trainer, Willie Reddish, Liston cancelled a planned tour to Africa in 1963 because he refused to get the required inoculations. Liston's wife also recalled that her husband would refuse basic medical care for common colds because of his dislike of needles.