There, Casarez confronted, shot and killed a man and then shot his ex-wife, according to the sheriff.
Following his rampage, the gunman turned his weapon on himself and killed himself before police could apprehend him.
Another person showed up at the scene after the suspect killed his wife, but the suspect killed that person outside the trucking business, the sheriff said of the chaotic and deadly sequence of events.
The tragedy began Wednesday afternoon at a trucking business, where the attacker used a handgun to shoot and kill his wife and another man.
Investigators aren't sure about a motive, but it appears the former couple had some type of connection to the trucking company, and the shootings appeared well-planned, Youngblood said.
Next, the suspect went to a nearby home and gunned down two more people, Youngblood told media.
The woman whose vehicle was taken, and her child, were unharmed. He headed to a nearby highway, where he saw a deputy and pulled over into a lot. "Six people lost their lives in a very short period of time", Youngblood said. Garcia and her father, Eliseo, were killed at their Breckenridge Road after the still unidentified gunman shot them both.
A woman and child were inside the vehicle at the time but managed to escape without injury.
The suspect then shot the man before turning and shooting his wife.
Authorities said the entire shooting took place within 15 minutes. Youngblood says the daughter may have tried to intervene.
Youngblood says it's not known if that was the catalyst for the violence.
The gunman's identity was not immediately released, and it was also not immediately known how he was related to the victims other than his wife.
About 30 people saw the shootings and were being interviewed by deputies, Youngblood said.