Watch TV Series Killer Relationship with Faith Jenkins Oxygen Online Free. Killer Relationship with Faith Jenkins investigates burgeoning romances from their sweet beginnings, and follows what happened all the way through to their bitter endings. With her background as a criminal prosecutor in the Manhattan District Attorney’s Office, and with her expertise in matters of the heart, Faith Jenkins gives her professional POV of the nightmarish cases. With first-hand accounts from victims’ family, friends and law enforcement, each hour-long episode reveals the inner workings of intimate attachments that seemed fated to last forever and ended in murder.