STEPHENVILLE, Texas (AP) – An Iraq War veteran charged with murdering former Navy SEAL sniper Chris Kyle and a friend turned a gun on the pair while they were at a Texas shooting range, authorities said Sunday.

Eddie Ray Routh, of Lancaster, was arraigned early Sunday in the deaths of Kyle, who wrote the best-selling book “American Sniper,” and Chad Littlefield, 35. They were killed at a shooting range at Rough Creek Lodge, about 50 miles southwest of Fort Worth.

Travis Cox, the director of a nonprofit Kyle helped found, told The Associated Press on Sunday that Kyle, 38, and Littlefield had taken Routh to the range to try to help him. Littlefield was Kyle’s neighbor and “workout buddy,” Cox said.