Mel Gibson
Mel Gibson was famous for his roles in countless popular films and was eventually a common household name. His career took a turn after he caused a horrific accident while driving drunk. That wouldn't be his last DUI incident nor his last alcoholic incident... It only got worse.
The Crazed Rant
As if he couldn't make things worse, he eventually went on an intense antisemitic rant to the press. Naturally, he was swiftly blacklisted and was without work for 10 years. He's slowly reprising his career and taking on some roles, but he leaves a bitter taste in most peoples' mouths.