Investigators in Las Vegas are working to determine the motive of the Indiana couple who ambushed 2 police officers during a Sunday shooting rampage.
2 officers were having lunch at a CiCi's Pizza as they were shot and killed.
The violence continued. Witnesses tell police the couple took the slain officers' guns and ran to a nearby Walmart. That's where they shot and killed bystander, Joseph Wilcox, before retreating behind the store.
Once behind the Walmart the woman reportedly fatally shot her husband then herself.
Witnesses say the shooters yelled "this is a revolution" during the attack.
Investigators believe the couple's actions may have been triggered by extremist views towards law enforcement.
Officials do think the shooting was an isolated incident, but, Jerad Miller has a lengthy criminal history in Tippecanoe County, Indiana where the couple used to live.