Dex has been casually involved with Leslie Carrington, but their relationship ends when Leslie has a fling with Jeff Colby and goes to work for Alexis. Dex develops a friendship with Jeff's ex-wife (and Blake's daughter), Fallon. In episode 187, Fallon asks Dex to help her investigate a business deal in Africa, where he discovers that the key contact there, Harry Thresher, has ties to Alexis's new husband, Sean Rowan. Dex grows more suspicious and tries to warn Alexis, who dismisses his warnings as jealousy. In episode 194, Leslie confesses to Dex that she has been sleeping with Sean, and learned that he is seeking to destroy Alexis in revenge for the suicide of his father, Joseph Anders, which he believes was caused by Alexis. Dex warns Alexis who fears the worst.