Alyssa Bustamante, a teenage girl who strangled and stabbed her 9-year-old neighbor, faces the possibility of life in prison when she is sentenced on Wednesday.

During Bustamante's hearing on Tuesday, prosecutors described the 18-year-old as a Thrill Killer who lacked remorse, the Associated Press reported. Defense attorneys, however, tried to persuade the court that Bustamante was a disturbed teenager from a broken home, who deserved to be free one day.

Bustamante was 15-years-old when she killed her neighbor Elizabeth Olten, in 2009. She told Missouri State Highway Patrol Sgt. David Rice that she always wanted to know what it felt like to kill someone. She later pleaded guilty in court. 

The teenager, who was abandoned by her mother and father as a child, has been fighting severe depression for years. In 2007, she tried to commit suicide by overdosing on painkillers. She was later prescribed the anti-depressant Prozac, of which she took an increased dosage before the murder, according to reports. Defense attorneys brought psychiatrist Edwin Johnston into court, who testified that a higher dosage of the drug could have increased the teenager's mood swings and violent tendencies.

Prosecutors in the murder case have ignored Bustamante's background of depression and focused on the deliberate nature of the murder. Accounts of the murder were recorded in Bustamante's diary and prosecutors used her chilling words in court to try and push for a longer prison sentence.

'I strangled them and slit their throat and stabbed them now they're dead,'' Bustamante wrote in her journal. ''I don't know how to feel atm. It was ahmazing. As soon as you get over the 'ohmygawd I can't do this' feeling, it's pretty enjoyable. I'm kinda nervous and shaky though right now. Kay, I gotta go to church now...lol.

Bustamante's trial will conclude in Missouri on Wednesday. Before the testimonies closed on Tuesday, Olten's grandmother screamed out from her wheelchair, I think Alyssa should get out of jail the same day Elizabeth gets out of the grave, the AP reported.