. >> this cousin, patrick nash, said carla asked to borrow his gun, a .38 caliber revolver, for protection. >> she tells patrick that there's been recent break-ins at her house and she's concern for her safety. >> patrick said that three days before the murder, he gave carla his gun loaded with five bullets. he also gave her a hunting knife. three days after the murder, she returned the gun, but not the knife. and the chamber of the gun was empty. >> patrick asked carla, hey, what happened to the bullets in it and she told him i went target practicing. >> the gun was given to ballistics experts and test fired so that the pults could be compared to those recovered from avis's body. >> the markings on the three projectiles from the body did match the markings from the test-fires which told me that that weapon was the weapon that killed avis banks. >> but this didn't necessarily put the gun in carla's hand. so investigators looked again at the shoe impressions from the crime scene. >> they assumed the impression was made by a man shoe which would have been a size 8. but it also could have bee