JEFFERSON CITY, Mo. -

A mid-Missouri teen who pleaded guilty to killing her nine-year-old neighbor in Oct. 2009 is asking the court system to set her free.

Alyssa Bustamante admitted she murdered Elizabeth Olten in mid-Missouri. However, Bustamante is arguing through her attorney that a life sentence is cruel and unusual punishment.

Bustamante was just 15 at the time of the murder. A hearing is scheduled for Friday in Jefferson City.