A Man Accused Of Killing A Boones Creek Couple And Their Unborn Child, Has Admitted To The Crime In Washington County Tennessee Criminal Court. As Part Of A Plea Agreement, 35 Year Old Derrick Sells Plead Guilty To Felony Murder In The Deaths Of Robert And Kyanan Vaughn In 2017. Kyanna Was Pregnant At The Time. A Judge Ordered Sells To Serve 51 Years Before He Can Appear Before The Parole Board.