Chris Kyle, an ex-Navy SEAL who wrote the best-selling book American Sniper about his service in Iraq, was shot and killed at a gun range in Texas, multiple outlets reported Saturday night. A second man was also killed.

According to local TV station KHOU, officials said that Kyle was shot at point-blank range "while helping another soldier who was recovering from post traumatic stress syndrome" at a range near the town of Glen Rose.

The Dallas Morning News reports that Lancaster, Texas police arrested a suspect, 25-year-old Eddie Ray Routh, after a brief chase.

Kyle had become well-known for his exploits in Iraq, where he deployed four times, set the record for sniper kills at 150, received numerous commendations, and, according to the Stephenville Empire Tribune, was given the nickname "The Devil of Ramadi" by insurgents