Debra Morgan finds out Dexter 's secret. Despite Dexter Morgan 's secrecy, there are characters who have either become aware that he is a serial killer, or have suspected him of murder. Does Dexter ever tell Deb the good stuff like how he killed Trinity and got Lundy justice? Does he? I'm like halfway through season 7.
Someone else said they mention Lumen but I haven't heard anything positive about that either. I know obviously he's a serial killer! But he did do some kills and disappearances that she was happy about at. This raises the question: when did Deb find out about Dexter? Well, Deb got to know Dexter's secret not in Dexter: Original Sin, but in the original series.
In the Dexter season 6 finale, she walked in on Dexter stabbing Travis Marshall in a church. Does Dexter tell Deb he's a killer - or does she find out on her own? Source: Showtime Dexter and Harry Morgan. Dexter and Deb are half-siblings, as Dexter was adopted by their father, Detective Harrison "Harry" Morgan after he found Dexter in a shipping yard where his biological mother was murdered.
Dexter obviously centered around the titular character of Dexter Morgan but his sister Deb was a major favorite among fans. Debra and Dexter Morgan are close adoptive siblings, but a weird season 6 revelation where Deb is in love with him strangely made sense. Debra Morgan (spelled Deborah in the novels) is a fictional character created by Jeff Lindsay for his Dexter book series.
In Lindsay's novels, she first appeared in Darkly Dreaming Dexter and was featured in every novel in the series. In the television series based on Lindsay's books, she is mainly portrayed by Jennifer Carpenter in Dexter and New Blood, and as a younger version of herself by. Dexter: Resurrection's Season 1 finale gives a much-needed callback to the original series, but it also helps prove something important about Dexter.
Debra Morgan confronts the chilling reality of her brother Dexter's secret life as a serial killer in the Season 6 finale, "The Blue Comet," a pivotal moment that irrevocably alters their relationship and the trajectory of the entire series. This revelation, delivered with brutal honesty by Dexter himself, shatters Deb's perception of everything she thought she knew about her brother. When Deb finally discovered that Dexter is a serial killer (season 6 finale), I was waiting up to the end of the show for her to bring justice to Dexter, and tell someone the truth (most likely Quinn).
She spirals out of control in the last two seasons because of her guilt of killing Laguerta and being involved in Dexter's criminal acts, but cannot bring herself to talking to the police. Why.