COLUMBIA, S.C. (AP) — The U.S. Supreme Court on Monday refused to review a 30-year prison sentence for a teen who was 12 when he killed his grandparents in their South Carolina home.

A juvenile justice advocate said Christopher Pittman, who turned 19 last week, was disappointed but stoic when she broke the news to him by telephone.

Pittman shot his grandparents Joe and Joy Pittman with a shotgun in 2001, then set fire to their home and drove off in their car. During his trial four years later, Pittman's attorneys unsuccessfully argued the slayings were influenced by the antidepressant Zoloft — a charge the maker of the drug vigorously denied.