The Kansas Supreme Court has upheld the convictions and sentence of a northeast Kansas girl who was 13 when she was charged with murder during a botched carjacking.

Justices unanimously agreed Friday that the district court was justified in prosecuting Keaira Brown as an adult for felony murder and attempted aggravated robbery in the 2008 killing of Scott Sappington Jr. The 16-year-old victim died of a gunshot wound to the head.

Sappington had just dropped off his younger siblings at his grandmother’s house and was on his way to work when he was killed.

Brown, of Kansas City, Kan., will be eligible for parole after serving 20 years.

The Supreme Court held the mandatory minimum sentence could be constitutionally applied to a person under 18 years of age.