He can’t be retried. Period. For any reason.
But he might have to go through some thrumped up charges of violating Martin’s “civil rights”, or a “wrongful death” civil charge brought by the parents. To me this is still double jeopardy and is against the Constitution. I despised OJ Simpson and thought he was guilty, but after the jury verdict I didn’t think it was right that he was tried for “wrongful death”, and of course lost. Just have always thought that civil suits are BS, just something to make lawyers rich.