Not what Irwin would want.
Irwin's personal philosophy was when you get hurt by an animal you're messing with, it's always your fault, and therefore he would not want the stingray to be harmed in any way or killed. It was a tragic accident, but no one deserves punishment. The stingray felt threatened and defended itself.
I personally feel taking it out on the stingray would be disrespectful to Irwin's ideals, but that's just me.