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It's been 10 years since the tragic death of Steve Irwin, but his daughter, Bindi, is still keeping his memory alive. On Saturday, the 18-year-old took to Instagram to share a sweet childhood photo of her and her dad, writing, "You'll be my hero for my entire existence. I love you more than words can describe." Throughout the years, Bindi has shared a handful of beautiful throwback pictures [2] of her and Steve. In July, she celebrated her birthday [3] by remembering him with a heartfelt post.