A judge has entered a not-guilty plea on behalf of a 15-year-old-girl charged with killing 9-year-old Elizabeth Olten.

This morning a grand jury handed down a two count indictment to Alyssa Bustamante. The first is a first-degree murder charge for the murder of Olten and the second count for armed criminal action.

Olten went missing October 21st after visiting Bustamante's home near St. Martins, Missouri. A few days later, police say Bustamante led them to Olten's body, buried in the woods.

Alyssa Bustamante appeared briefly before a Cole County judge, just hours after she had been certified to stand trial as an adult in Olten's murder.

Earlier Wednesday, a police officer testified that Bustamante had confessed to killing Elizabeth because she wanted to know "what it felt like to kill someone".

Court documents said that Bustamante allegedly strangled, stabbed and cut Olten's throat.

"I hope the public remembers Elizabeth for who she was and my thoughts go out to her family. This is an exceptionally difficult case for everyone I'm sure," said Cole County Juvenile Attorney Samantha Green.

Bustamante could face life in prison without parole if convicted.