Carly Gregg, the Mississippi teenager who killed her mother and tried to kill her stepfather, was found guilty on all charges and sentenced to life in prison.

Mississippi teen Carly Gregg was severely depressed and possibly hearing voices when she allegedly gunned down her own mother, psychiatrists testified at her trial Thursday — but one argued she committed a “diabolical” act that keeps her from meeting the requirements of an insanity defense.

After days of testimony, which included security video and police body cam video, a Mississippi jury found Carly Gregg guilty.