"....executioners tried to establish the backup IV line in arms, shoulders, foot, jugular and chest. When they tried to establish a central line, she described it as Carruthers being "stabbed" multiple times and called it "torture."
While death row inmates aren't guaranteed a pain-free death, the U.S. Constitution mandates that their executions be free of "cruel and unusual punishment."
...but the three people he killed weren't "guaranteed a pain-free death" either...