One of the only other people who dies in the second half is Adam, who has been a notably terrible character throughout the entire season. He is one of the few Americans in season four, coming from a rich East Coast family. He is in a relationship with Lady Pheobe, but has a history of cheating on her to indulge in a power play style of fetish. We also discover in this season that he has lost all of his business projects and all of his possessions. He tries to hold on to Pheobe to keep his social status, even taking advantage of her extremely vulnerable state (all of her friends are dead) by asking her for a very quick wedding. This particular death has nothing to do with Joe or the Eat the Rich Killer. Kate's father Tom Lockwood recognizes that Adam is causing distress with his daughter's relationship with Lady Pheobe, so he hires people to take care of Adam.
