SHE WAS supposed to shoot the pit bull named 'Cocaine'--but instead Betty 'Quick Draw' Walker put two bullets into her husband's chest in a bizarre Jackson, Mississippi. According to cops, 'Cocaine' "lunged and tried to attack some children." That's when Betty pulled out her gun and fired, hitting hubby Robert Walker, 53, in the chest. He was dead in the hospital two hours later. 'Cocaine' was only wounded.But Robert Ferguson, 19, whose cousin owns the pit bull told the Jackson Clarion-Ledger that the dog isn't aggressive and is kept in a fenced in pen when the owner is out. He heard the gunshots and saw poor
