An autopsy performed on Katherine "Katie" Gillihan was inconclusive as to what caused , Benicia police said Friday.
However, they said toxicology reports are not done, and they released new information: They said they believe the death of resulted from a physical confrontation with her live-in boyfriend, Adam Wade Disa.
And they said they believe the murder in the couple's home at 804 Military East occurred early the morning of Wednesday, Feb. 9, and that it did not involve a weapon.
"The cause of death is still under investigation by the Solano County Coroner's Office pending toxicology reports expected to be completed in the next two weeks," Benicia Police Lt. Mike Daley said.
The Solano County Coroner's office refused to comment on the autopsy referring all questions to the Benicia Police Department.
Last week, , police said he admitted to a confrontation with Gillihan on Feb. 9 that resulted in her death.
Daley's statement Friday went on to say, "Although I cannot comment on the specifics of the altercation, I can say that no weapon, such as a handgun or a knife, was used in the attack."
Disa's attorney, Chief Public Defender Oscar Bobrow, also declined to comment on the case, noting that he had only seen a preliminary police report.
Daley's comment noted, "Also, the Solano County District Attorney's Office has charged Disa under California's 'Three Strike' law.
He is being held with no bail. If convicted, Disa could face a sentence of 25 years to life in prison. His arraignment is set for Tuesday.