>> last year at church camp i went for one of our activities. we fired shotguns, and it most resembled that sound. >> then it was time for heath to take the stand. the last time tom had seen his boy was at a hearing, also in court, almost a year earlier. >> while you're in the barn, do you hear something? >> yes. i thought it was maybe skyler kind of ran into a wall, either that or a gunshot. >> you think the boys actually were, if not eyewitnesses then earwitnesses to murder. >> earwitnesses to what happened. >> tom schafer knew if he had any hope of getting tom foley acquitted, he'd need to prove the sound those boys heard was anything other than a gunshot. just two weeks before trial began, while inspecting crime scene photos, schafer found what may be the key to his client's freedom.