OJ Simpson in court

Disgraced NFL great O.J. Simpson claims he has brain cancer, and he wrote a letter begging President Obama for a pardon so he can die at home.

Simpson, 66, is serving a 33-year prison sentence in a Nevada prison for kidnapping, assault and robbery. Many believe Simpson is also paying the price for getting away with murdering his ex-wife, Nicole Simpson, and her friend, Ronald Lyle Goldman, in a fit of rage in 1994. Simpson was represented by a "dream team" of high profile lawyers including Johnnie Cochran and Robert Kardashian, Kim Kardashian's late father.

A source told The National Enquirer Simpson is undergoing "secret" tests to confirm a brain tumor. Simpson reportedly has a history of diabetes and chronic high blood pressure.

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Breast cancer survivor Sheryl Crow was diagnosed with a benign brain tumor after experiencing memory problems.

Crow, 50, said she grew concerned when she forgot the lyrics to one of her songs onstage.

"I was worried about my memory so much that I went and got an MRI. And I found out I have a brain tumour," Sheryl told Las Vegas Review-Journal.

The Grammy award winner, who was serenaded by Rihanna at a recent breast cancer benefit, told her audience "I'm 50, what can I say? My brain's gone to s--t."

Crow will not require surgery.

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