PHILADELPHIA (AP) – A woman found slain in a park was identified as a medical student who had vanished while out running last weekend, authorities said Friday.

An autopsy confirmed the body found late Thursday was Rebecca Park, a student at the Philadelphia College of Osteopathic Medicine from Olney, Md., police Inspector William Colarulo said. He said the cause of death was homicide.

After hearing on television that Park was missing, a woman had called police Thursday to say she had heard a scream in Fairmount Park about the time the woman vanished Sunday afternoon, police said.

Police found the body – clad only in a jogging bra, sneakers and socks – under wood and leaves on a steep hillside, less than a mile from Park’s garden apartment.

Park, 30, had told her boyfriend she was going running about 4 p.m. She typically ran a two-mile route through the park, past police stables where she enjoyed watching the horses, Detective Michael Chitwood said Friday.

The boyfriend, a fellow medical student, and Park’s father, who lives in Maryland, went to police Wednesday to report her missing. Chitwood said investigators had feared foul play because Park was a fourth-year medical student and a second lieutenant in the Army Reserves.

so “her life is very orderly.”

The boyfriend, who was not identified, is not a suspect, Chitwood said.

Fairmount Park covers 8,900 acres and includes winding creeks, nature trails, ball fields and picnic areas.

AP-ES-07-18-03 1406EDT