BANGOR, Maine (AP) – A Bangor man accused of killing his 49-year-old girlfriend has tearfully pleaded guilty to manslaughter. David Coon told a judge Thursday that “I lost my girlfriend which wasn’t supposed to happen.” He also told the judge that he loved the victim, Sherry Clifford. But Superior Court Justice Ann Murray didn’t accept his plea, and the hearing was continued. A police affidavit indicates Coon told investigators that the two were on the floor in a tussle when he covered her mouth to keep her from screaming. The medical examiner concluded Clifford died from asphyxiation and a neck injury.