A former Tarleton State University student who wrote the best-selling book, "American Sniper," was one of two victims shot and killed at Rough Creek Lodge Saturday. 

Chris Kyle, 38, and another man were found dead at Rough Creek's shooting range between 3:30 and 4 p.m. Saturday, according to Sheriff Tommy Bryant.

Eddie Ray Routh, an Iraqi war veteran, was arrested hours later after a manhunt led authorities to Lancaster where Routh was taken into custody just before 9 p.m. Saturday.

Routh, 25, is expected to be charged with capital murder.

Investigators had not released the name of the second victim at press time, but reports indicate he may have been Routh's neighbor. 

Bryant said the three men were at the shooting range Saturday when Routh shot the victims at point-blank range before fleeing in Kyle's truck .

Kyle was a former Navy SEAL who served four tours of duty in Iraq, where he was given the nickname "The Devil of Ramadi" by insurgents. 

In 2008, he made his longest successful shot after he spotted an insurgent with a rocket launcher near a U.S. Army convoy at a range of 2,100 yards (1.2 miles). 

Kyle was recently honored by the Tarleton Alumni Association as the Outstanding Young Alumnus for 2013.    

"Our hearts go out to Chris’ family and friends at this tragic moment,” Tarleton State University President, Dr. Dominic Dottavio, said. “We are proud of his exemplary service to our nation and are deeply saddened to hear the news of this tragic event.”  

Kyle leaves behind a wife, Taya, and two children.