Charlie Sheen
Charlie Sheen's ultimate undoing was revealing that he was HIV-positive on live TV in 2015. 10 of his previous sexual partners sued him after the news broke because he hadn't disclosed the truth to them. He claimed, however, that he had told all 200+ of the women that he'd slept with, but that turned out to be false.
Hulk Hogan
Hulk Hogan was put under fire for making some extremely racist comments in the middle of his own sex tape. That's a two-for-one. He says he's "racist to a point," and follows the comment with various slurs. He was immediately terminated from WWE events after the video surfaced.