Las Vegas police have released a chilling video that shows the final, frenzied moments of Sunday's deadly shootout between police and a couple who authorities say killed two police officers at a pizza restaurant and a shopper at a nearby Wal-Mart.

The surveillance footage — taken from inside the store — appears to show Amanda Miller firing at her 31-year-old husband, Jerad Miller. At a news conference on Wednesday, Assistant Sheriff Kevin McMahill said police believe she missed, and Jared Miller was killed by a fellow police officer.

The video then fades to black as the 22-year-old points a gun at herself. Police say Amanda Miller shot herself in the head.

Investigators believe the Millers' anti-police and anti-government attitudes fueled Sunday's rampage.

Witnesses say the couple entered CiCi's Pizza around 11:30 a.m. Sunday, fatally shooting two police officers — 31-year-old Igor Soldo and 41-year-old Alyn Beck — as they were having lunch. According to police, the pair took the officers' guns and ammunition and placed a "Don't Tread on Me" flag and a Nazi swastika on one of them.

McMahill said police had talked with the couple on three different occasions earlier this year — once for threats Jerad Miller allegedly made to motor vehicle officials in Indiana — but that they did not express anti-police views.

"We don't necessarily believe that they are white supremacists or associated with the Nazi movement," McMahill told reporters on Tuesday. "We believe that they equate government and law enforcement ... with Nazis. In other words, they believe that law enforcement is the oppressor."

As they entered the Wal-Mart, witnesses say, Jerad Miller shouted, "This is the beginning of the revolution! Everybody get out! You will be shot!"

"There is no doubt that the suspects have some apparent ideology that's along the lines of militia and white supremacists," McMahill said.

The third victim, Joseph Wilcox, was shot while trying to stop the couple as others fled the store.

Police say they recovered hundreds of rounds of ammunition from the couple's backpacks.

Reuters reports the Millers had expressed support for Cliven Bundy, the Nevada rancher who staged a protest on his property against federal agents over a forced roundup of his cattle from public land. The couple even visited the ranch but were asked to leave after other demonstrators expressed concern about Jerad's "aggressive nature and volatility," the Bundy family said.