Since this get necro'd. . .
With all the fics out there I have never seen one that actually tried to get Harry out of obligations by using the "I died" loophole. Nobody ever tried to cheat him out of his fortune that way either. It might make for an original plot point, but perhaps not for this story.
I have. It was a oneshot. Harry Won? and wiped out Voldemort. However, Fudge hated
Harry, and a lot of people in the Ministry were utterly terrified of him because of how powerful he was. So they decided to bring him up on charges of murder for killing Voldemort. In Wizarding Law, you have to be brought before the Wizengamot and have whatever crimes you've committed confirmed by a jury of your peers. Because Voldemort had never been captured, he had never stood trial, and because he had never stood trial, "Tom Marvelo Riddle" was, technically speaking, legally
innocent of any wrongdoing, as none of his crimes had ever been confirmed before a jury of his peers.
So Harry gets dragged up before the Wizengamot, and they're going to sentence him to death, and Dumbledore is there, and he's tried to get Harry off and has argued at what an injustice and travesty this is, but his hands are completely tied, because nearly everybody is terrified of Harry and is for this, and they are technically
correct, as far as legality goes.
So they render the sentence, but before the closing, they ask Harry if he has anything to say. He blurts you "you can't kill me" in a panic. Fudge laughs, and asks why.
Harry is all "You can't kill me because. . . because. . . " and he gets this distant, far-away look in his eye. Then he said the kicker.
"You can't kill me. I'm already dead."
Harry explains. "It's a matter of public record that the Potters were attacked by Voldemort at the end of his first reign, right? And it's also a matter of public record that Harry James Potter was struck by the killing curse, right?
"Well, the Killing Curse is unsurvivable. Everybody knows that. And no magic can resurrect the dead. Everybody knows that, too. Ergo, Harry James Potter died when he was one year old."
Fudge is flabbergasted. He turns around and consults a group of wizened members who are carrying books of law. They flip through pages back and forth, whispering furiously. Fudge gets paler, and paler, and paler.
Finally, shaking, he turns around. Harry was right. No one can survive the Killer Curse. Anyone struck by it is dead. His hand trembling, he has no choice but to strike his gavel and declare that Harry James Potter is free of all crimes, and indeed legally cannot
crimes, because he is a dead man, and you cannot apply crimes to people after they've died in wizarding law. He can't be incriminated for anything. Ever. He has total, absolute legal immunity to do whatever the hell he wants, and there's nothing they can do to stop him.
Everyone is stunned. Horrified, even. Harry Potter smiles, stands up, and hits Fudge with a Killing Curse. He falls off his podium, and hits the floor. Harry walks out of the courtroom, whistling jauntily and twirling his wand. Dumbledore is laughing.