The 35-year-old Ortiz was arrested in Huntington Beach, Calif. Monday morning and released later in the day. He's charged with assaulting Jameson, with whom he has one-year-old twin sons.
"Tito Ortiz never laid a hand on Jenna, never," his lawyer Chip Matthews told reporters.
Matthews went on to say that the domestic problems stem from Jameson's battle with an addiction to prescription drugs, specifically Oxycontin.
According to a Fox News report, Ortiz pleaded guilty to battery charges in 1998 and was sentenced to three years probation, 29 days in jail and 232 hours of community service.