John Plague

John Plague (1888-2020) was a suspect in the death of Larissa Cooper before being the killer of Roman Cooper in Season 1 Case 10. Later in Part 1, he was suspected in the deaths of Mufta Mufta and Archibald Zu. During Part 3, John was a suspect in the death of Jean Carto before killing Mark Tukkia. He was murdered two cases later.

Suspected in the Deaths of: Killer In: Killed In:
 * 1) Larissa Cooper (Part 1 Case 6)
 * 2) Roman Cooper (Part 1 Case 10)
 * 3) Mufta Mufta (Part 1 Case 14)
 * 4) Archibald Zu (Part 1 Case 31)
 * 5) Jean Carto (Part 3 Case 20)
 * 6) Mark Tukkia (Part 3 Case 23)
 * 1) Roman Cooper (Part 1 Case 10)
 * 2) Mark Tukkia (Part 3 Case 23)
 * 1) John Plague (Part 1 Case 25)
 * 2) Edward Umbridge (Part 1 Case 35)