A Sullivan County Jury Has Found Robert Seth Denton Guilty On All Counts In A 2015 Triple Murder In Bristol Tennessee. Denton Was Convicted On Three Counts First Degree Murder, Two Counts Of Aggravated Assault And Reckless Endangerment. He Killed His Mother, Grandmother And Stepfather. District Attorney General Barry Staubus Says The State Is Seeking Life In Prison Instead Of The Death Penalty. The Judge Will Determine Denton’S Sentence At A Later Date.