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Sheriff's deputies delivered the fatal wound that killed a man who, along with his wife, gunned down two police officers and a civilian in Las Vegas on Sunday, a sheriff's department official said Wednesday, according to CNN. 

Authorities had earlier said the woman shot and killed her husband before taking her own life. But Assistant Sheriff Kevin McMahill told reporters Wednesday that a review of forensic evidence at the scene and autopsy results showed that police fatally wounded the gunman.

"We made a determination that she did not shoot him. He did suffer a gunshot wound, and we believe the entrance wound was here," McMahill said, pointing to his own collarbone.

In fact, he said, the fatal wound was delivered from a rifle fired by police. McMahill said three officers fired on the suspect.

"We do not believe any of her shots hit him," he said.

McMahill said investigators were reviewing a "tremendous" amount of graphic video of the suspects during the rampage.

"The video shows you exactly how vicious and coldblooded these murderers were," he said.

In the Walmart security video, released by police, the Millers are seen in their final moments. They are lying wounded in an aisle with various store items surrounding them -- items, police say, they used for cover. They hold firearms, which they at times point at each other. At the end of the video, Amanda Miller turns the gun on herself.

The latest developments came as still-shaken colleagues of the fallen officers wore black bands to pay tribute to Igor Soldo, 31, shot in the back of the head, and his partner, Alyn Beck, 41, struck by a bullet in the neck.

The killers apparently considered law enforcement as oppressors, authorities said. They placed a "Don't Tread on Me" flag and a Nazi swastika on one officer and left a note saying, "This is the beginning of the revolution," on the other officer's body, authorities said.

After gunning down the officers, Jerad and Amanda Miller ran to a nearby Walmart, police said, where they killed a bystander before barricading themselves inside the store during a firefight with responding officers.

On Wednesday, authorities revealed that police had previous contact with the couple on three occasions this year -- in February, April and on May 31 -- without incident. "There was no indication provided by the suspects of their anti-police feelings," McMahill said.