Carly Gregg, the teen who killed her mother and tried to murder her stepfather, has been sentenced to life in prison. On Friday, September 20, a 15-year-old was sentenced after jurors in Rankin County, Mississippi, found her guilty on all charges, including first-degree murder, attempted murder, and tampering with evidence, as reported by The Clarion-Ledger. When the verdict was read, Gregg showed clear emotions, breaking down in tears.