MAJOR shakeup in the "Big Brother" house -- CBS confirms Evel Dick Donato had to leave the show for "personal reasons" ... and will no longer compete this season.
The network wouldn't specify the exact reason for Evel Dick's departure.
Dick -- who won the $500,000 grand prize on "Big Brother" Season 8 -- was invited back on the show this season, along with his estranged daughter Daniele.
Daniele will continue to participate in the show -- and because of Evel Dick's departure, she was given a "golden key" ... which guarantees she can not be eliminated in the next 4 weeks.
CBS states, "His departure will be addressed on the episode to be broadcast on Wednesday, July 13. "