a live regular round it's got a projectile tip. g a primer. >> reporter: on the set, the gun sat unattended on a cart for two and a half hours, the attorneys alleged, when someone tampered with the ammo. >> she tried to do her best now, she couldn't be around the cart 24/7 there were other assistants that were supposed to be watching the weapons when she could not be. >> reporter: with no proof of the new allegations and no charges filed, they sheriffs says gutierrez-reed and halls remain the focus of the investigation. >> i went to work every day unwittingly playing a game of russian roulette. >> reporter: camera assistant lane looper resigned hours before the fatal shooting >> everybody right now is trying to reach for answers. allegations like that, they just seem irresponsible and shortsighted and - and lame and, quite frankly, offensive. >> reporter: the production company has not responded to the new allegations. tonight new accounts