Florida has executed a death row prisoner convicted of killing his wife and young son nearly 30 years ago. John Henry was the third prisoner to be put to death in the United States this week following executions in Missouri and Georgia. They are the nation’s first executions since Oklahoma’s botched killing in April. The Oklahoma prisoner, Clayton Lockett, writhed and groaned on the gurney before dying of a heart attack 43 minutes after his lethal injection. Several executions were delayed or stayed in the aftermath of Lockett’s death, with defense attorneys citing the threat of similar suffering.