The appellate court

The appellate court decides that the trial court committed reversible error by including evidence found by law enforcement. Law enforcement discovered this evidence when committing a Fourth Amendment violation, which should have been excluded at trial. This inadmissible evidence was the lynchpin of the prosecutor’s case, which resulted in a conviction. Where does the case go from here? Is the Defendant free to go? Does it go back to the trial court? Does it go all the way up to the Supreme Court?