Denise Notinelli remembers the perfectly pressed clothing, the manicured nails, the hands she looked at and imagined around her mother’s throat. It was April 26, 2006. Daryl Mack, 47, the man who killed her mother nearly two decades earlier, was lying on a gurney in the execution chamber at Nevada State Prison in Carson City, prepared for the state to kill him. Daryl Mack, who already was in prison for the 1994 murder of Kim Parks, was convicted in April 2002 of the 1988 murder of Betty Jane May. A month later, a three-judge panel sentenced Mack to death by lethal injection. He had eaten his last meal: a fish sandwich, fries and a soda. He had rejected offers of Valium tablets. A prison staffer hidden behind one-way glass sent a cocktail of drugs into his body via an IV: sodium thiopental to knock him out, pancuronium bromide to paralyze his lungs and stop his breathing, potassium chloride to end the beating of his heart, the Las Vegas Review-Journal reported at the time. By 9:06 p.m., he was dead.…