Police are releasing more details about the death of a woman whose body was found in the passenger seat of a truck in southeast Calgary.

The victim has been identified as 37-year-old Kathy Lynn Reid.

"Reid died as a result of asphyxiation consistent with strangulation," said Calgary police in a release.

A 36-year-old Calgary man has been charged with first-degree murder. 

Reid's body was found in the passenger seat of a pickup truck at 17th Avenue and 84th Street S.E. at about 4:45 a.m. MT on Wednesday after the driver called emergency workers to report that his passenger was dead.

"The initial report was that both occupants of the truck had consumed drugs and the woman had overdosed," police said in a release.

Investigators allege the woman actually died from a physical assault that happened outside the city.

Police say the victim and the accused were in a casual relationship, but were not dating.

They had been driving around inside and outside the city since 8:30 p.m. the previous day, according to police. 

"It is alleged that while outside of Calgary, the two had a disagreement, and the woman was physically assaulted by the accused, causing fatal injuries," police said.

Officers are awaiting autopsy results. They are also working with RCMP, who have jurisdiction outside the city.