Former Bengals head coach Forrest Gregg announced to the Associated Press on Wednesday that he's been diagnosed with Parkinson's disease.
Although the cause of the debilitating neurological disorder is unknown, Gregg, his family and his neurologist say his disease may be related to numerous concussions he suffered during his playing career in the 1950s at SMU and from 1956-71 with the Green Bay Packers and Dallas Cowboys.
Gregg, a nine-time Pro Bowl lineman and seven-time First-Team All-Pro during his playing career, is best known to Bengals fans as being perhaps the most successful head coach in franchise history with a winning percentage of .561. Additionally, and perhaps more notably, he was Cincinnati's head coach during the franchise's first Super Bowl appearance in 1981 where the Bengals went an AFC-best 12-4, losing to the San Francisco 49ers during Super Bowl XVI.
He spent four seasons with the Bengals, winning four playoff games, before leaving for the Green Bay Packers following the 1983 season.