Brown was tried as an adult in criminal court for the first-degree premeditated murder and first-degree felony murder of Johnny Allen.
Advocates for Brown said she was a sex-trafficked teenager and that she was a child destined for despair the night she shot and killed Allen.
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Allen was 43-years-old at the time and Brown was 16. She received a life sentence.
Now, the Tennessee Supreme Court issued an opinion saying that Brown must serve at least 51 years in prison for Allen's murder.
Back in May, a state board was split on whether to allow clemency for Brown after hours of emotional testimony.
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