Erath county officials scheduled a Sunday afternoon news conference to discuss the murders of two men, including former Navy SEAL Chris Kyle.
Kyle and another person were shot and killed Saturday at a shooting range at Rough Creek Lodge, near Glen Rose, southwest of Fort Worth. A suspect was later arrested in Lancaster, south of Dallas.
The second victim's identity is unknown.
Sheriff's department officials did not immediately know what caused the suspect to open fire.
Witnesses told investigators that the suspect left the shooting scene in a pick up truck that belonged to one of the victims. Police tracked that truck down to a home in Lancaster.
Police say the suspect, Eddie Ray Routh, then left the home and tried to evade officers in another vehicle. Officers deployed spike strips to disable Routh's vehicle, arrested him, and charged him with two counts of Capital Murder.
Kyle served multiple tours of duty in Iraq, and has the highest number of sniper kills in U.S. military history. He received three Silver Stars and five Bronze Stars for his service. His colleagues nicknamed him, "The Legend."
He appeared on Fox 4 News in January 2012 to talk about his book "American Sniper", which detailed some of his combat experiences. He also detailed his work as president of Craft International, a company he founded which provides security, defense and combat weapons training to military, law enforcement and civilians. Kyle was also known for his dedication to helping disabled veterans.
Kyle's foundation FITCO Cares issued a statement on it's web site that read in part, "Thank you for your concern and sentiment. Please pray for all those who loved Chris. He will be forever missed."
Kyle was 38 years old and lived in Midlothian in Ellis County. He is survived by his wife and two children.