Season 1, Episode 5 - Season 1: Episode 5 (Souvenirs). Original air date: 4/13/14. Thomas' (James D'Arcy) decision to stop working on active cases causes Catherine (Chloe Sevigny) to investigate his past, leading her to an unexpected family history. Catherine takes Thomas to the scene of her childhood trauma where she finally reveals all the details that still haunt her. Check out Those Who Kill photos and extras.