Mahorn was dubbed by Piston announcer George Blaha the "Baddest Bad Boy of them all." Mahorn gained a reputation for physical play, which he used to compensate for his relatively limited leaping ability. He served as a team leader of the Detroit Bad Boys teams of the late 1980s.
Mahorn later played for the New Jersey Nets for four seasons, before returning to the Pistons in 1996–97. He retired after the 1999 season, after a second stint with the 76ers. Mahorn then served as a color commentator for Pistons radio broadcasts, and as an assistant coach under former teammate Bill Laimbeer with the WNBA's Detroit Shock.
On July 22, 2008, at a Sparks-Shock game, Mahorn attempted to break up a brawl. When attempting to restrain Lisa Leslie, he put his left hand out and Leslie fell to the ground. Mahorn was suspended for two games.
On June 15, 2009 he became the head coach of the Shock, a position he held until the franchise moved to Tulsa, Oklahoma after the season.