Joe's neighbour and colleague at Darcy College, Malcolm Harding (Stephen Hagan), is the first character to die in season four. He is confident, pompous, and wealthy, so Joe hates him, naturally. Although Joe despises being in his presence, he vows not to make his new life in London like his old one by murdering him.
Imagine Joe's surprise when he finds Malcolm stabbed to death and missing a finger on his dining room table after a night of debauchery with Malcolm's wealthy friends. Joe doesn't believe he killed Malcolm, but given his past, he doesn't put it past himself. He dismembers Malcom's body and disposes of it throughout London.
Later, Joe gets an anonymous text that someone had planted the dead body in his living room and planned to frame Joe for the murder. This is our first introduction to the Eat The Rich Killer.