16-year-old pleads guilty to murder of 10-year-old Kiaya Campbell in 2017
BRIGHTON, Colo. -- The teenager accused of killing a 10-year-old Thornton girl pleaded guilty first-degree murder on Friday and is facing life in prison when he's sentenced next month. Aidan Zellmer, 16, was charged as an adult in the death of Kiaya Campbell on June 7, 2017, after they left her father’s home to go to a shopping center.