Eugene "Mercury" Morris, who starred for the unbeaten 1972 Dolphins and helped the team win two Super Bowl titles, has died at age 77.

In 1982, Morris was convicted of cocaine trafficking and was sentenced to 20 years imprisonment, with a mandatory 15-year term. In 1986, his conviction was overturned by the Florida Supreme Court because evidence he had offered to prove his entrapment defense had been excluded under a mistaken characterization as hearsay.

Mercury Morris, the former Miami Dolphins and San Diego Chargers running back who won two Super Bowl championships, has died, his family said Sunday. He was 77.