A gunshot wound to the right temple was the probable cause of death for Brooke Phillips, 22, of Moore, the office said.
The report shows Phillips suffered a slit throat, a stab wound to her abdomen and gunshots to her left arm, left index finger and right leg and cuts to her hands and wrist.
The medical examiners report on Phillips body also described a petroleum odor, indicating some type of accelerant may have been poured on or around the womans body.
Another woman whose body was found in a burning Oklahoma City house on Nov. 9 received three gunshot wounds, the medical examiner said.
The probable cause of death for Millie Barrera, 22, of Mustang were gunshot wounds to the back and head, the office said.
Both women were pregnant.
Autopsy reports have not been made available for the other two victims, Casey Barrientos, 32, and his girlfriend, Jennifer Ermey, 25.
A former Marine has been charged with six counts of first-degree murder.
Prosecutors in Oklahoma charged David Allen Tyner on Friday with shooting, stabbing and then burning the bodies of Phillips and three others on Nov. 9.
Because 2 of the women were pregnant, two more murder counts were filed.
A police affidavit says a witness told police someone known as "Hooligan" argued with one of the victims before the shootings.
Investigators say "Hooligan" was later identified as Tyner.
An attorney for Tyner couldn't immediately be reached for comment.
Tyner, 28, surrendered last week to the Mayes County Sheriff's Office on a warrant that included six murder complaints.
Phillips had worked at the Moonlite BunnyRanch, a legal brothel near Carson City, Nev. that is featured in the HBO series.
Firefighters discovered the four bodies Nov. 9 in a burning home on the city's southwest side.
Tyner was a two-time state champion wrestler from Salina who finished his high school career at Locust Grove, where he was a state runner-up his senior year in 2000, said Johnny Cook, Tyner's wrestling coach at Locust Grove.
"This is just unbelievable," Cook said. "He was as good a kid as you could find - a hardworking, passionate kid who'd give you the shirt off his back."
After high school, Tyner wrestled at the University of Tennessee-Chatanooga and later joined the U.S. Marine Corps, Cook said.
After a stint in the military, Tyner became a cage fighter and compiled a 6-1 record as a mixed martial artist.
Jason Nicholson, a former fight promoter who described Tyner as "like a brother," said Tyner was planning to fight in Kansas City next month.
"Knowing what he's charged with shocks me the most," Nicholson said.
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