Missouri woman wants to undo her teenage guilty plea in 2009 slaying of 9-year-old neighbor

A Missouri woman who wrote that killing a young neighbor was "pretty enjoyable" now wants a judge to overturn her guilty plea.

Alyssa Bustamante was to appear in court Thursday for a hearing on whether to set aside her plea in the 2009 slaying of 9-year-old Elizabeth Olten. Bustamante was 15 at the time. She wrote in her diary that killing was "ahmazing" and "pretty enjoyable."

She initially faced a first-degree murder charge, punishable by a mandatory life sentence without parole. Bustamante pleaded guilty in 2012 to second-degree murder. She was sentenced to life with the chance of parole.

The U.S. Supreme Court later ruled that juveniles cannot face mandatory life sentences.

Bustamante says she would not have pleaded guilty without the threat of mandatory life imprisonment.