Famed wildlife expert and TV personality Steve Irwin wrote a letter to his parents that has just now become public, just days before the 10th anniversary of his death.

Irwin's father, Bob, reportedly stumbled upon the lost note while working on a soon-to-be-released memoir, "The Last Crocodile Hunter."

In the emotional letter, unopened until recently, Irwin told Bob and his mother, Lyn, that he was just beginning to realize his parents' importance.

"At 32, I am finally starting to figure it out. In good times and in bad, you were there. Your strength and endurance to raise me will not go unrewarded. My love for you is my strength!" he wrote. 

He lamented that it was unfortunate in a "Bloke's Life" that it took 30 years to realize "how essential" his parents were "to build my character, my ethics and, most importantly, my HAPPINESS."

Irwin concluded the letter by calling his parents his "best friends!"

The 77-year-old Irwin said the note fell out of a book that he was using to do research for the memoir. Lyn Irwin was killed in a car accident in Australia in 2000.

The letter was written four years before the birth of Irwin's daughter, Bindi.

Bob Irwin said last year that he was not on speaking terms with his 18-year-old granddaughter after she won the "Dancing With the Stars" competition. 

Steve Irwin, who was beloved by viewers of the Animal Planet's "The Crocodile Hunter," died in 2006 when a stingray attacked and punctured his heart while he snorkeled.

The 10th anniversary of his death is on Sunday, September 4th.

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