Irwin died in September when a stingray barb pierced his chest while he was filming a documentary in Australia.
Pictures of Maher were widely circulated on the Internet and sparked outrage, with critics labeling the outfit inappropriate and insensitive.
Maher hits back saying, "Stop hassling me about my Halloween costume. Yes, you've seen it on the Internet.
"I went as the Crocodile Hunter with a bloody stinger in my chest. People who really love animals understand if you get killed by one, chances are you were doing something to it you shouldn't have been.
"You want me to apologize for making a joke? Who do you think I am, John Kerry?"
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