Karl Otto Kassulke (March 20, 1941 – October 26, 2008) was a professional American football player. Kassulke graduated from Drake, where he starred as a safety. He played 10 seasons in the National Football League, all with the Minnesota Vikings. Kassulke started in Super Bowl IV, where he and teammate Earsell Mackbee missed a tackle on Otis Taylor on the final touchdown of the game, late in the third quarter. The next season, he was selected to the Pro Bowl. On July 24, 1973, Kassulke suffered a motorcycle accident on the way to training camp that left him paralyzed from the waist down.