Helmig, a Missouri man convicted of murdering his mother, filed his appeal with the state Supreme Court on Wednesday. He accuses Kenny Hulshof, the former congressman who prosecuted him, of withholding information from the defense and presenting false evidence. (The case was featured on last weekend's "America's Most Wanted" -- one of the rare cases where they've argued someone might be wrongly convicted.) He also wants new DNA tests that weren't available the first time around.
A 2008 Associated Press investigation found that in addition to the Kezer case, prosecutorial errors by Hulshof led to four death sentence reversals, although in several cases subsequent trials led to new convictions.