Trackdown: Help find Alberto Sarmiento's killer Police said the suspect ended up getting nothing, but took everything from Alberto Sarmiento. Surveillance video shows the killer back on December 30, 2020, which was a rainy cold night in Dallas. He was carrying a bag of some sort, or fanny pack, which was draped across his shoulder. The victim had come to Dallas from Guatemala to work as a day laborer, hoping to make a better life, but he lost his life in his apartment complex courtyard. Detective Tonya McDaniel said the same man who killed Sarmiento robbed someone else before the killing. "If you know this person, you need to turn them in. Call them out for what they're doing," Det. McDaniel said.