By Dailymail.com Reporter
Published: 23:34 GMT, 11 March 2019 | Updated: 23:58 GMT, 11 March 2019
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Aidan Zellmer, 17, from Colorado has been sentenced to life in jail after pleading guilty to first-degree murder in the death of 10-year-old Kiaya Campbell
A Colorado teenager who sexually assaulted and killed his 10-year-old stepsister has been sentenced to life in prison.
Aidan Zellmer, 17, pleaded guilty to first-degree murder in the 2017 death of Kiaya Campbell last month in Adams County District Court.
In exchange for his guilty plea, prosecutors dropped an additional count of first degree murder and a sexual assault charge against the teen.
'In 27 years as a prosecutor, I have never seen a 15-year-old commit such a violent act,' 17th Judicial District Attorney Dave Young said.
'He wanted to do this… His actions certainly dictate that he intended to kill her and it took quite an effort to do it. And then to conceal it, not only to hide the body but mislead. Certainly indicates that his brain was developed and he knew what he was doing,' said Young.
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