Juwan Howard
A two-time NBA champion, Howard joined the Michigan Wolverines after he retired from playing basketball. Then he became a highly-rated college coach and led them to the Big Ten title. But the controversial seedy superstar had an unsavory incident in 2022 (via ESPN).
He punched a Wisconsin assistant in the face after a heated dispute boiled over. This caused a courtside brawl and attracted the attention of the NCAA. They suspended him and hit him with a $40,000 fine for his troubles. Howard claimed that he was protecting himself but nobody believes that.