ST. LOUIS (AP) – A St. Louis man has been sentenced to three years in prison for causing the accident that killed a pregnant 15-year-old passenger in his car.

The St. Louis Post-Dispatch reports that 21-year-old Bryan Green pleaded guilty Monday to armed criminal action and second-degree manslaughter. The accident happened March 6, 2014, when Green’s 2007 Acura sped through a stop sign and struck a Ford Focus before hitting a tree.

The car split in half, killing Jada Williams, who was in the backseat. She was a high school sophomore. A front-seat passenger was injured but survived.