What the jury saw was a musclebound hulk in a 4X jacket. What they heard about was barbaric: two cold-blooded robbery murders within 12 days, four dead and a suspect who was said to laugh hysterically as he mimicked the gurgling last breaths of one victim. Who they heard it from: an alleged accomplice granted immunity, a jailhouse informant, an acquaintance with a checkered criminal past, a friend who later claimed police beat him into testifying. A police expert tied a shell casing from one crime scene to a slide-action 12-gauge shotgun owned by Stanley "Tookie" Williams, but there were...