( CNN ) The call to police was for cardiac arrest . But the strangulation and trauma wounds on the 18-year-old woman suggested something far more violent happened . Karlie Hall was found in her dorm room Sunday morning at Millersville University , about an hour west of Philadelphia , the Lancaster County District Attorney 's Office said . Her boyfriend , 19-year-old Gregorio Orrostieta , called 911 around 5:20 a.m. , prosecutor Craig Stedman said . `` We did n't know we had a crime at first , '' Stedman told CNN . But the prosecutor said Orrostieta later told authorities the couple had a fight . An autopsy Monday revealed Hall suffered trauma and strangulation wounds . Orrostieta has been charged with criminal homicide . He is being held without bail . Stedman said the couple started dating 11 months ago , when she was in high school . Orrostieta is not a student at Millersville University . About three hours before Orrostieta called 911 , a residential assistant heard a struggle and knocked on Hall 's dorm room door , Stedman said . But no one answered the door , and the residential assistant went back to bed . `` Our university community has suffered an unfathomable loss , '' Millersville University President John Anderson wrote . He said counselors will be available throughout the week . Ex-Virginia lacrosse player sentenced to 23 years in ex-girlfriend 's killing .
18-year-old Karlie Hall was found fatally injured in her Millersville University dorm room . The teen had been shot multiple times and died at the scene.