Eric Davis, who was Kyle's direct instructor at the SEAL sniper course, said that from his own book and from Kyle's appearance in other military memoirs, Kyle comes off as a consummate professional and an earnest man.
Davis wrote today that the picture Americans are slowly getting of his star student is just right.
"Often times the impression we get from someone's public persona can be very different from who they actually are," Davis wrote on the special operations website SOFREP.com. "[T]he Chris Kyle that you read about in books, watch on interviews, and will be reading about for years to come is not some made-up public persona... [That's] who Chris Kyle really was."
In a September 2012 interview posted on SOFREP.com, Kyle said that 100 percent of the profit he received from his memoir goes to the families of fellow American service members featured in the book who were killed in action.
"The book definitely -- it's my stories and it has their stories in it, but I'm trying to highlight the people who were the true heroes. And I don't consider myself one of those guys," he said.
ABC News' Dean Schabner contributed to this report.