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\"In good times and in bad, you were there,\" the letter continued. \"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 Irwin closed the note by saying, \"Thank you.\"

Bob Irwin found the heartwarming letter earlier this year in an unopened envelope while doing research for his memoir, \"The Last Crocodile Hunter: A Father and Son Legacy,\" out in November.

\"PHOTO:
Newspix/Getty Images
PHOTO: Steve Irwin is seen with his daughter, Bindi Irwin, and a 3-year-old alligator called 'Russ' at Australia Zoo in this June 25, 2005 file photo.
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