RIVERSIDE, Calif. -- A Virginia sheriff’s deputy who police say traveled to California to kill three family members of a 15-year-old girl he tried to sexually extort online killed himself with a government-issued firearm, authorities said Saturday.Austin Lee Edwards, 28, drove across the country and on Nov. 25 killed the girl's mother and grandparents and set fire to their home in Riverside, a city about 50 miles (80 kilometers) east of downtown Los Angeles, authorities said.“Our detectives determined the gun used was Edwards’ department-issued semi-automatic service pistol,” sheriff’s spokeswoman Gloria Huerta said in a statement.But a police report from the Abingdon Police Department in Virginia shows he was detained in 2016 for a psychiatric evaluation over threats to kill himself and his father, years before he joined law enforcement.On Thursday — a day after the Los Angeles Times broke the news about the mental health episode — the Virginia State Police said a recently completed review showed “human error” resulted in an incomplete database query during the hiring process."