Efren Antonio Villarreal-Alvarado, 43, was shot and later died on February 21, 2014, while sitting in his truck in the parking lot of Santana Concrete in Wichita, Kansas. Co-workers found him around 7:15 a.m.; he was alive with a gunshot wound to the chest and was taken to a local hospital where he died a short time later. His former wife, Dawn Villarreal, said he had been alone and dying for 45 minutes before being found.

Police concluded the shooting was a robbery: Villarreal-Alvarado’s wallet, keys, cellphone, and identification were taken. Investigators said they believed he knew the suspects and had been specifically targeted. Two men, Deon Nolan Hale and Donnie Lalonde, were arrested and charged with first-degree murder and aggravated robbery. Lalonde later pleaded guilty to second-degree murder and aggravated robbery and was sentenced in October 2015 to 24 years and one month. Hale, who also used the alias Auriel Huntstwobears, was convicted of voluntary manslaughter and received eight years and four months; he had a previous murder conviction from 1997.

Did anyone who knew Efren or worked at Santana Concrete that morning see or hear anything that could add detail about the attack?