He played college football for the Northwestern State Demons and was selected by the Dolphins in the second round of the 1982 NFL draft.
Nicknamed "Super Duper", he played 11 seasons for the Dolphins where his best years came while teamed with Pro Football Hall of Fame quarterback Dan Marino and fellow wide receiver Mark Clayton, the other half of the "Marks Brothers" wide receiver tandem.
On July 17, 1993, the Dolphins released Duper, after re-hauling their receiving corps bringing in O.J.
[1] Duper was also a track star, he won in the finals of the 400-meter relay at the 1981 NCAA track and field championships at Northwestern State University, and from the 1980 Olympic trials finished seventh in the 200-meter dash and reached the semifinals of the 100.
[2] Duper was inducted (with Mark Clayton) into the Miami Dolphins Honor Roll on December 15, 2003.