Authorities said Austin Lee Edwards, a 28-year-old Virginia sheriff's deputy, traveled across the country to commit the murders after catfishing a 15-year-old girl.
A local police report, received through a Virginia Freedom of Information Act request, shows Edwards allegedly threatened to kill himself and his father and had cut his hand in a bathroom on Super Bowl Sunday of 2016 after drinking two beers.
Edwards' father said the younger Edwards might have been upset over relationship issues with a girlfriend.
Austin Lee Edwards allegedly struggled with his dad, refused to follow police orders and fought efforts to put him in handcuffs, according to the police report. Edwards was then transported for a psychiatric evaluation.
Riverside murders: Tearful family member pays tribute to victims amid probe in 'catfishing' case
Riverside murders: Tearful family member pays tribute to victims amid probe in 'catfishing' case
The police report includes pictures that show knives and injuries to Edwards' wrist.
Despite the incident, which was first reported by the Los Angeles Times, Edwards was able to become a law enforcement officer in Virginia.
Edwards died by suicide on Nov. 25 in Kelso, a remote area of San Bernardino County's Mojave National Preserve, after fleeing the murder scene, sheriff's officials said.
The 15-year-old girl was rescued and was placed in counseling for trauma, police said at a news conference last week.