 Swift moved into the starting lineup as a rookie and held the strongside linebacker position for the next six seasons, including the Dolphins' Super Bowl victories following the 1972 and 1973 seasons.Swift's blitz late in the second quarter of Super Bowl VII forced Washington Redskins quarterback Billy Kilmer to make a hurried throw, which Nick Buoniconti intercepted and returned into Washington territory to set up the Dolphins' second touchdown in a 14-7 victory, cementing Miami's 17-0 season.Made available in the 1976 NFL Expansion Draft, he chose to retire from football and enter medical school rather than report to the expansion Tampa Bay Buccaneers.