>> where was the murder weapon? >> we've searched by land, by air, and we have searched by water rescue. there's a pond out there. we drudged the pond searching for the gun and still not have been able to locate the firearm in question. >> when police looked at footage of amy bosley leaving her home on the night of the murder, they noticed that amy wasn't carrying her pocketbook. her sister was. after amy's arrest, amy's sister finally got around to looking inside. when she did, she found a .9 millimeter handgun. >> her sister did the appropriate thing. she hired an attorney to turn over this key piece of evidence and that's how it made it to our office. >> she was hoping her sister would chuck it in the river or dispose of it. >> ballistic experts compared the handgun to the shell casings found in the bedroom and inside the washing machine.