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Croc Hunter's dad Bob Irwin pens memoir

AAP logoAAP 1/09/2016 David Sigston

Bob Irwin's memoirs will contain a touching letter he found that his famous son Steve had penned to his parents 12 years before he died.

Mr Irwin announced his memoirs would be released in October, with the announcement coming just days before the 10th anniversary of his son's death.

The 77-year-old has co-written his book with Amanda French and the letter turned up while Mr Irwin was researching for the book.

The letter the late TV personality wrote to his parents appeared on a News Corp site on Thursday.

It displays how much appreciation Steve, who died on September 4, 2006, had for Bob and Lyn.

"Probably one of the most unfortunate things in a 'Bloke's Life' is that it takes over 30 years to realise how essential you have been to build my character, my ethics and, most importantly, my HAPPINESS," the Crocodile Hunter wrote.

"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!

"For the rest of my life I will reflect on the unbelievably GREAT times we've shared and will continue to share. You're my best friends!"

Steve died after being stung multiple times by a stingray off Queensland.

"Working on this book I have been constantly reminded of Steve's boundless energy, infectious humour and unrestrained passion for wildlife," Mr Irwin says.

The Last Crocodile Hunter: A Father and Son Legacy, which follows Mr Irwin's journey from a Melbourne plumber to conservationist, will be launched on October 25.

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