A Pennsylvania college soccer star was allegedly stabbed to death by her boyfriend, who claimed “demons” told him to do it — and got his mom to help him dispose of the body, according to police. Karoline Heintz was found dead in the back hatch of her Jeep Cherokee at around 12:30 a.m. Thursday, just outside the Pennsylvania Western University campus in California, Pa. Heintz, an incoming freshman on the university’s women’s soccer team, had met up with her boyfriend, Royce Mosher, after she attended a family party earlier in the evening, Pennsylvania State Trooper Rocco Gagliardi told reporters.