An 18-year-old is accused of fatally stabbing his girlfriend, Karoline Heintz, placing her body in the trunk of her own car, and then driving to his mother’s home, where prosecutors say an attempted cover-up began. Investigators say Royce Moser searched online about demons controlling people to kill, removing fingerprints, and whether an 18-year-old could face the death penalty. Prosecutors argue the searches point to premeditation, while Moser and his mother, Rachel Moser, remain jailed as she is accused of helping clean up and conceal the crime. ▻