CONCORD (CBS SF) — A 911 call Sunday night directed Concord police to a woman’s body inside a hotel room, authorities said.

Lt. Nick Gartner of the Concord Police Department said his agency got the 911 call at 10:24 p.m. reporting a female possibly being assaulted in a room at the Best Western Heritage Inn at 4600 Clayton Rd.

When officers arrived at the room, they found a woman who was unresponsive. CPR was administered but the woman was pronounced dead at the scene.

She was identified by Concord Police as 24-year-old Fresno resident Guadalupe Riggi.

“We are treating everything as a homicide,” Gartner said. “We got some good leads last night that we are following up.”

Officers and investigators worked through the night to track down the 911 caller who had left the scene prior to the officers arrival. An alert was issued for a car suspected to be driven by the caller and within hours he and his car were located several counties away.

The unidentified man was detained and questioned by Concord investigators. His role in the death has yet to determined.

At this point, authorities said, the coroner was trying to determine the cause of the woman’s death. Investigators will also continue to follow up on other leads.

If you have any information in regards to this investigation, please contact Major Crimes Detective Smith at (925) 603-5859.