A judge sentenced an Iowa man to 65 years in prison Thursday for killing two students at a Des Moines alternative school and injuring the program’s founder.

Polk County District Judge Larry McLellan sentenced Preston Walls, 19, to consecutive terms for his September conviction on charges of second-degree murder, voluntary manslaughter and assault causing serious injury.

Jurors acquitted another man, Bravon Tukes, who had been charged with murder and other counts after he drove Walls away from the shooting. Walls testified in that trial, saying Tukes hadn’t planned the shooting and had no role in the killings.