Former U.S. Navy SEAL sniper Chris Kyle was shot and killed at a gun range in Texas on Saturday, Feb 2, 2013.
Reportedly, a gunman opened fire at about 15:30 local time then fled in a pick-up truck belonging to one of the victims.
Another person who was with Chris Kyle was also shot dead. A suspect named Eddie Ray Routh was arrested, according to reports.
Kyle and another man was found dead at the Rough Creek Lodge located in Glen Rose, Texas, about 50 miles southwest of Fort Worth.
Scott McEwen, who wrote the book with Kyle said, "It just comes as a shock and it's staggering to think that after all Chris has been through, that this is how he meets his end, because there are so many ways he could have been killed".
The BBC wrote, "Iraq veteran and ex-US Navy seal Chris Kyle, known as the deadliest sniper in US history, has been shot dead on a Texas shooting range, reports say.
"Erath County Sheriff Tommy Bryant said the motive for the killings was unclear, and was unable to explain how the two men were shot."
"According to army intelligence, he was nicknamed "The Devil" by Iraqi insurgents, who put a $20,000 (£13,000) bounty on his head."
Chris Kyle was responsible for 160 kills during his career as U.S. Navy SEAL sniper.