2. Luis Resto
After his 1983 bout with Billy Collins Jr., Resto was found to be using thinly padded gloves and hand wraps cast in plaster of Paris. Resto and his trainer, Panama Lewis, were later convicted of assault and other charges; Resto was sentenced to two-and-a-half years in prison. Collins' boxing career was subsequently ended due to permanent eye damage. Less than a year later, Collins ran his car into a ditch, killing himself instantly.