weeks before melvin's disappearance. coincidentally, a .25-caliber shell casing was discovered in melvin's barn on the day he disappeared. police searched harshman's home and found ammunition for a .25-caliber weapon, but no gun. >> i asked him where the gun was and he said, you'll have to ask teresa. she's the one who took the gun. she liked it and she took it. so when we asked her, she said no, it's a lie, i don't even like guns. i don't know anything about the gun. >> during their investigation, police also learned that ron harshman and melvin snyder once had an unpleasant confrontation over the affair that melvin was having with ron's wife. >> he learned that mr. snyder was coming to his home to pick up his wife, and he crashed his car into him.