BRANDON, Miss.--Robert Floyd McGuire will spend the rest of his life in prison following his Thursday conviction on murder charges. Madison County D.A. Michael Guest told News Mississippi the 48-year-old murdered his girlfriend in Oct. 2011 and tried to sell a defense to the court that it was an accident.

Guest released details about the crime that came out in the two-day trial.

He said McGuire asked neighbors to call cops, telling them he had just shot his girlfriend. According to Guest, McGuire claimed it was an accident from the time Brandon PD arrived. When they got there, they found Lynda Tate, described as a long-time girlfriend of McGuire, dead in a chair.

McGuire had blood on his hands, face, shirt, pants and socks, according to Guest. He also appeared to be drunk. Police found several beer cans in the house. They also found several shell casings, bullet fragments and a gun close to the body. Tests later confirmed it was the gun used to shoot Tate in the head.

McGuire was arrested on the scene, even though he claimed it was an accidental death.

"This was a senseless crime where the victim's life was taken by someone she loved," said Guest. "This death has shattered the lives of the victim's family. I can only hope they find some comfort knowing the person that has taken her life has now been sent to prison for the rest of his life."

Guest praised Brandon PD for their crime scene work.