I found this in my local news site:
http://www.denverpost.com/breakingnews/ci_25928184/2-officers-bystander-killed-las-vegas-ambush
Money quote:
“The suspects then fled on foot to a nearby Wal-Mart, where Jerad Miller fired a single shot upon entering, police said. A patron at the store who carried a firearm confronted Jerad Miller, not realizing that he was accompanied by Amanda Miller, who shot and killed the man, police said. He was identified as 31-year-old Joseph Wilcox of Las Vegas.
“Joseph died trying to protect others,” Sheriff Doug Gillespie said.”
Well done, Joseph Wilcox.