NEW YORK (AP) - Former "Two and a Half Men" star Charlie Sheen says he has HIV.

In an interview Tuesday on NBC's "Today," the 50-year-old Sheen says he tested positive for the virus that causes AIDS. Sheen said he's known for four years about his diagnosis.  Sheen says he began experiencing cluster headaches and migraines and that a battery of tests revealed he had HIV. Sheen says he's not sure of how he contracted the virus.

Sheen also says he has paid people well into the millions to keep quiet about it, but he says after today he won't be paying anyone and will be releasing himself of "this prison."

Drug and alcohol use have marred Sheen's personal and professional life in recent years. He was kicked off CBS' "Two and a Half Men" in 2011 after an explosive meltdown that included calling the show's producer "a contaminated little maggot."

His escapades have also included the revelation that he spent more than $50,000 as a client of "Hollywood Madam" Heidi Fleiss' prostitution ring.

"Two and a Half Men" debuted in 2003 and starred Sheen as womanizing bachelor Charlie Harper. It made Sheen one of TV's highest-paid actors and at its peak was TV's most-watched sitcom.

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