A Grandview teenager will serve life in prison for killing an Olathe North High athlete and injuring a 13-year-old girl at a Mission apartment complex in 2022. On Thursday, Deon Austin, 19, was sentenced in Johnson County Court for first-degree murder and aggravated assault for shooting and killing a 16-year-old boy and injuring a 13-year-old girl at the SilverWood Apartments on Foxridge Drive in Mission on April 10, 2022.