A man is under arrest in connection with the killing of two men at an Erath County, Texas, gun range, police said.

One of the victims is reportedly former Navy SEAL and best-selling author Chris Kyle.

ABC affiliate WFAA-TV in Dallas reported that three sources said Kyle, author of the New York Times bestselling book, "American Sniper," and a neighbor of his were shot while helping a soldier who is recovering from post traumatic stress syndrome at a gun range in Glen Rose.

The suspect, identified as Eddie Routh, 25, was arrested in Lancaster, Texas, after a brief police chase, a Lancaster Police Department dispatcher told ABC News.