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UFC star Tito Ortiz apparently can’t keep the violence in the ring: He was arrested Monday on charges he abused his girlfriend, ex-porn star Jenna Jameson. However, Ortiz quickly proclaimed his innocence and said Jameson is addicted to OxyContin. The couple shares a home and has twin sons. Jameson was spotted with visible injuries, including an arm brace; the UFC chief says Ortiz faces expulsion from the league.