A Virginia law enforcement officer accused of "catfishing" a 15-year-old girl and killing her three family members last month ultimately shot himself with a government-issued firearm, the department revealed Saturday.

Austin Lee Edwards, 28, drove across the country and on Nov. 25, killed the teen's mother and grandparents and set fire to their home in Riverside, California, authorities said.

Austin Lee Edwards, 28, is accused of killing three people in Riverside. He was shot and killed by San Bernardino County Deputies. (Riverside Police Department)

That same day, Edwards died by suicide during a shootout with San Bernardino sheriff's deputies. The teenage girl was rescued. Law enforcement previously indicated that Edwards may have died in gunfire with officers.

"Our detectives determined the gun used was Edwards' department-issued semi-automatic service pistol," sheriff's spokeswoman Gloria Huerta said in a statement.

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The cause of the death of the girl’s three family members remains unclear.

Edwards, a resident of North Chesterfield, Virginia, appears to have posed online as a 17-year-old boy to engage in a romantic relationship with the girl. Police said Edwards obtained her personal information by deceiving her with a false identity, known as "catfishing."

69-year-old Mark Winek, 65-year-old Sharie Winek and 38-year-old Brooke Winek found dead inside Riverside, Calif. home. (Riverside Police Department)

Authorities said the girl stopped communicating with him after he asked her to send him nude photos of herself.

Edwards was a former Virginia state trooper and was a sheriff's deputy in Washington County, Virginia, at the time of the killings.

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Fox News Digital has reached out to Virginia State Police and the Washington County Sheriff's Office for comment.

The Associated Press contributed to this report.