McMahill said both Millers appear to have been wounded, but the gunfire ended when Amanda Miller shot her husband several times and then shot herself. She was still breathing when police reached her, but died while she was still in the Walmart store.
In the aftermath of the carnage, neighbor Krista Koch said the Millers were open about their intentions to kill cops.
“They always talked about murdering cops,” Koch told ABC affiliate KTNV-TV. "They were going to kill as many officers as they can, and then they were going to do away with themselves."
The police officers who died were both married with children. Beck had been with the department since 2001 and leaves behind a wife and three children. Soldo had been with the force since 2006 and is survived by a wife and baby, police said.
Soldo was described as a good father and a "great guy" by his sister-in-law, Colleen Soldo of Beatrice, Nebraska. She said he attended high school in Lincoln, Neb., and previously worked as a corrections officer.
Sheriff Doug Gillespie called Wilcox's death “completely senseless.”