Rapid City Teen Pleads Guilty In 2018 Shooting DeathPosted by John AxtellDate: February 12, 20211593 Views A Rapid City-area teenager is pleading guilty to the 2018 shooting death of a Rapid City man. 19-year-old Ross Johnson of Black Hawk accepted a plea agreement and pleaded guilty to aggravated assault and accessory to a crime in the death of 43-year old Nathan Graham. Prosecutors say Johnson was in a physical altercation with Graham when he shot the older man in the head. Johnson and a 14-year old at the scene were friends of Graham’s stepson. Johnson was originally charged with aiding and abetting 2nd degree murder and aggravated assault, but the aiding charge was reduced and other counts dropped.