A teenager killed by police in Illinois on Saturday afternoon was shot twice in the back, an autopsy has revealed. Justus Howell, 17, died when officers fired one bullet into his heart and another through his shoulder. Police responding to news of 'an argument' at 2pm had chased Justus down the street before opening fire, according to a spokesman for Zion Police. The high school senior, who had moved to the area from Wisconsin in February, was pronounced dead at the scene. Killed: Justus Howell, 17, was shot twice in the back by police in Zion, Illinois, on Saturday afternoon . His mother, LaToya Howell, told Fox News Justus wanted to be a surgeon. 'Justus was a young man murdered by Zion police,' she said. 'As he was fleeing from police, they killed my son. He couldn't have been a threat if he was running.' A resident who lives feet from the scene, Bobbie Vaughan, spoke to Fox to describe what she heard. The teenager, who had moved to Zion from Wisconsin in February, wanted to be a surgeon, his mother said . Witnesses said they heard an officer say they had shot the boy. It is not known if a cop is suspended over it . 'I heard the officer tell the other officer, "I shot him,"' she said. 'They were shaking him, but he didn't move. 'He was on his stomach, so they turned him over and the police officer I was with gave him CPR.' According to the Chicago Tribune, officers tended to the teenager before he was taken to hospital. It is not known whether an officer has been suspended while the shooting is investigated. The Zion police chief didn't return calls Monday seeking comment about the autopsy results. Toxicology results are pending. Sorry we are not currently accepting comments on this article.
Justus Howell, 17, was running from scene of an 'argument' on Saturday .
Police chased him down, shot him twice in the back, according to autopsy .
He was pronounced dead at the scene in Zion, IL, at 2pm .