He played college football for the Michigan State Spartans and was selected in the sixth round of the 1994 NFL draft.

Miller ultimately appeared in a total of five games with the Steelers, who released him prior to the 1997 regular season in favor of Mike Quinn.

Miller next signed with the Detroit Lions in March 1998, but was released by the team in August, prior to the start of the regular season.

That promising season was cut short for Miller when he became the first quarterback to be suspended by the NFL for violation of its substance abuse policy.

Miller contended he did not read the label on an over-the-counter dietary supplement containing the steroid nandrolone, a banned substance under the NFL's drug policy.

On January 19, 2002, the Chicago Bears met the Philadelphia Eagles in the NFC Divisional Playoffs with Miller as quarterback.

[21] Miller served as the color commentator for Michigan State football radio broadcasts and hosted the weekly post-game call-in show from 2006 until he took a communications position with the Bears in 2013; he was replaced by Jason Strayhorn.