Replying to your question about if Donnie is dead or not, no, he isn't dead. I read the comic book after the incident and he is just in a coma. He's in a coma but a couple smart friends of the turtle's help figure out a way to put Donnie into Metal Head's body sorta. He kinda controls Metal Head with his mind. But while he's still in a coma. To find out more info, I suggest reading the comic because, heck, what do fangirls and fanboys know? Unless it says, "Donnie now has officially died" in the comic, it's most likely made up. Thanks for asking!