If you are talking about the guy convicted of murder even after the actual murderer confessed and also recanted his accusations that Wolfe ordered the murder (all surppressed by the prosecution)?
http://apublicdefender.com/2014/02/04/virginia-prosecutors-will-do-just-about-anything-to-execute-justin-wolfe/
This was criminal misconduct by the prosecutor and Wolfe should have grounds to sue the Commonwealth for a boat load of money.
Here is what the court of appeals 4th district said of the prosecutor withholding evidence from the defense:
During Wolfe's evidentiary hearing in the district court, the Commonwealth's Attorney explained that his office does not have an "open-file policy," providing criminal defense counsel access to entire case files. See J.A. 3690. Asked to elaborate, he offered the flabbergasting explanation that he has "found in the past when you have information that is given to certain counsel and certain defendants, they are able to fabricate a defense around what is provided." Id. Additionally, the Assistant Commonwealth's Attorney admitted that he does not produce evidence to a criminal defendant unless he first deems it to be "material[]" and "credib[le]." Id. at 3782. The district court rightly lambasted that conduct in its Brady Order:
In effect, Ebert admits here that his contempt of defendants who "fabricate a defense" guides his perspective on disclosing information. This is particularly troubling in the case at bar where the record is replete with statements from Ebert and Conway regarding the scrutiny and credibility determinations that they made (as opposed to the jury) regarding the relevance of any potential exculpatory evidence. Essentially, in an effort to ensure that no defense would be "fabricated," Ebert and Conway's actions 424*424 served to deprive Wolfe of any substantive defense in a case where his life would rest on the jury's verdict. The Court finds these actions not only unconstitutional in regards to due process, but abhorrent to the judicial process.
http://scholar.google.com/scholar_case?case=18432954970590598003
In other words if they only evidence against you is by the trigger man in a murder himself and then said trigger man recants and there is no additional evidence you cannot convict. Its criminal that the Commonwealth withheld the recantation by the actual murderer from the Wolfe and his attorney.