O.J. SIMPSON'S AGONIZING END

Fading ex-con trapped in prison of pain

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EVIL O.J. Simpson beat the criminal rap for butchering his ex-wife Nicole Brown and her waiter friend Ron Goldman, but sources reveal the remorseless monster is losing his battle with a more savage and cruel fiend — the Grim Reaper.

The 76-year-old NFL legend is dying — as he secretly fights incurable heart disease — and his last days are filled with agony from arthritis and old football injuries, according to insiders who say the brute’s been forced into seclusion.

“Karma’s coming back to bite him hard, and he looks like he’s in constant pain,” says an insider. “He’s become a recluse who’s scared to go out and face the world because he’s so loathed.”