Bustamante then headed off to a youth dance at her church while a massive search began for the missing girl.
Alyssa Bustamante confessed to murdering a young neighbor.
The Associated Press contributed to this report.
Alyssa Bustamante, 18, had pleaded guilty to second-degree murder and armed criminal action in the October 2009 slaying of Elizabeth Olten in their small Missouri town. In her diary, she described the experience as pretty enjoyable.
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Background report asian girl news, video from NBC affiliate KOMU TV
Bustamante had been charged with first-degree murder. By pleading guilty to the lesser charges, she avoided a trial and the possibility of spending her life in an adult prison with no chance of release.
I just want you guys to know that I really am sorry for everything, Bustamante said. I know that words can never be enough and they can never adequately describe how horrible I feel.
JEFFERSON CITY, Missouri -- A teenager who confessed to strangling, cutting and stabbing a 9-year-old neighbor because she wanted to know how it felt to kill someone was sentenced Wednesday to life in prison with the possibility of parole.
Bustamante was 15 when she confessed to strangling Elizabeth, repeatedly stabbing her in the chest and slicing the girls throat. She led police to the shallow grave where she had concealed Elizabeths body under a blanket of leaves in the woods.
The teenagers defense attorneys had argued that Bustamantes use of the antidepressant Prozac had made her more prone to violence. They said she had suffered from depression for years and once attempted suicide by overdosing on painkillers.
Prozac defense used in teens trial
But prosecutors noted that Bustamante had dug two graves several days in advance. Missouri State Highway Patrol Sgt. David Rice testified that the teenager told him she wanted to know what it felt like to kill someone.
Prosecutors also cited journal entries in which Bustamante described the exhilaration of killing Elizabeth.
After the judge delivered the ruling, Bustamante spoke directly to the girls mily, NBC affiliate KOMUasian girl news Teen gets life for strangling stabbing girl 9 in thrill kill TV reported.
I strangled them and slit their throat and stabbed them now theyre dead, Bustamante wrote in her diary, which was read in court by a handwriting expert. I dont know how to feel atm. It was ahmazing. As soon as you get over the ohmygawd I cant do this feeling, its pretty enjoyable. Im kinda nervous and shaky though right now. Kay, I gotta go to church now ... lol.
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