When "American Sniper" star Bradley Cooper and director Clint Eastwood asked Wayne Kyle permission about making a film about his son, the father looked them in the eye and said if they disrespect his son, he will "unleash hell" on them.
In response, Eastwood and Cooper also looked the father and told him they would honor the memory of his son and assured him they would not do anything to infuriate the family.
"That was good enough for me," the 65-year-old patriarch told Daily Mail. He added both Eastwood and Cooper men he could trust.
"I liked them both. The fact that they came to Texas to meet with me showed they were serious about what they were going to do," he said of Eastwood and Cooper who he described "very respectful and honest."
The father, who is a retired telecoms worker, also admitted to Eastwood that he was not happy that a movie was being made about his son but the director was very respectful and told him they would tell the truth.
What the father was afraid of was "what Hollywood can do and how it can change things." He also confessed he has mixed feelings about watching a film about his son on the big screen, which will bring back a lot of emotions and memories.
"American Sniper" is about the life of Chris Kyle, and his four tours of duty in Iraq from 2003 to 2008. During those tours, he used a high powered sniper rifle to kill 255 insurgents, which made him deadliest sniper in the history of American military.
However, another veteran said to be suffering from post-traumatic stress syndrome (PTSD) shot the highly decorated Navy SEAL, who was only 38 at the time, at a Texas gun range in February 2013.