A Superior Court jury found Phillips guilty of seven counts yesterday. He was accused of choking his girlfriend on two occasions in August 2005, once into unconciousness.
Phillips was once one of the nation's top college football players at Nebraska. He went on to play for the St. Louis Rams, Miami Dolphins and San Francisco 49ers.
Phillips is already serving a 10-year sentence for hitting three teenagers with his car in Los Angeles.
He faces up to 25 years in prison when he's sentenced next month.