A Sutton woman was beaten to death on Saturday night by the man she lived with, according to the Worcester district attorney’s office. Thomas O. Starefos, 49, called police just after 10:30 p.m. Saturday, prosecutors said. Police arrived and found Colleen Butler, 60, dead inside her home at 30 Torrey Road, the district attorney’s office said. Starefos was arrested at the house on charges of manslaughter and domestic assault and battery, according to prosecutors. Paul Jarvey, a spokesman for the district attorney’s office, said the two had been romantically involved in the past, but he did not know if they were still together the night Butler was killed. Starefos is scheduled to be arraigned Monday in Uxbridge District Court, Jarvey said.