Aurora Police Department SWAT Officer Michael Dieck will not face criminal charges in the death of 37-year-old Kilyn Lewis, who Dieck fatally shot outside an apartment complex in May while trying to arrest him on suspicion of attempted murder. Arapahoe County District Attorney John Kellner found Dieck “reasonably believed there was an imminent danger of death or serious bodily injury,” justifying the deadly use of force under Colorado law, Kellner wrote in a decision letter published Friday.