Dexter: Original Sin Just Confirmed The Darkest Season 1 Killer Theory

WARNING! This article contains SPOILERS for Dexter: Original Sin season 1, episode 7!The twist ending of Dexter: Original Sin season 1, episode 7 confirms who killed Jimmy Powell, and it’s going to shake up Miami Metro Homicide. In Dexter: Original Sin season 1, episode 2, it was revealed that Jimmy Powell, the 10-year-old son of a prominent Miami judge, had been kidnapped, with the child then being found dead in episode 4. Shortly after, Captain Aaron Spencer’s son, Nicky, was kidnapped by the same masked figure and his severed finger was sent to Miami Metro, leading the department to focus on theories about who was behind it and why.

Since Jimmy’s kidnapping, Captain Spencer has been adamant that those responsible are connected to drug cartels that he and Powell helped put away. Spencer increased the team’s focus on cartel members after Nicky was kidnapped, leading to some speculation that it could be linked to Hector Estrada’s drug operation. However, that isn’t the case. Dexter: Original Sin season 1, episode 7 finally reveals the masked killer’s identity after his blood is found on the box with Nicky’s finger, and the twist confirms one of the most surprising fan theories.

Dexter: Original Sin Season 1 Episode 7 Confirms The Theory That Aaron Spencer Is The Main Killer

A Fan Theory About Captain Spencer Was Proven Correct

After analyzing the blood spatter on the box with Nicky’s finger, seeing Spencer’s nervousness at the discovery, noticing a hesitation cut on the finger, and finding Spencer at his desk in forensics trying to discount the hypothesis that the blood isn’t Nicky’s, Dexter concludes that Aaron Spencer is Jimmy’s killer and Nicky’s kidnapper. If Dexter’s own supposition wasn’t convincing enough, the end of Dexter: Original Sin season 1, episode 7 shows Spencer buying the Sunnymates Ham and Cheese Meal box that was given to Jimmy and Nicky in captivity.

Dexter: Original Sin Season 1’s Shocking Villain Identity Twist & Killer Motivations Explained

Dexter: Original Sin revealed the shocking true identity of the villain who kidnapped Jimmy Powell and Nicky Spencer, but it needs to be explained.

While it initially seemed like a red herring, there were already some convincing fan theories that Spencer was Jimmy’s killer in Original Sin. It seemed even more likely that Patrick Dempsey might turn out to be the secret killer after playing a police sheriff-turned-serial killer in the 2023 horror movie Thanksgiving, with Dexter ultimately repeating this twist and proving the theory correct. Given the twist reveal about Captain Spencer, some lingering questions about his character’s future and fate in the main series now have explanations.

Dexter Discovering The Truth Reveals Why Aaron Spencer Isn’t In The Original Series

Dexter Will Likely Kill Spencer In Original Sin Season 1

Dexter Morgan (Patrick Gibson) looks over Aaron Spencer's (Patrick Dempsey) shoulder in Dexter: Original Sin season 1, episode 7

When it was revealed that the Miami Metro Homicide Captain would be a new character in Dexter: Original Sin, there were questions about why Aaron Spencer was never mentioned or seen in the main series – especially since Thomas Matthews eventually takes over the role. However, that mystery now has a solution, as Dexter discovering that he’s a child killer and kidnapper suggests that he’ll put Spencer on his table and kill him in Dexter: Original Sin season 1. Of course, Dexter will need to find some irrefutable proof that Spencer fits the code for Harry to sign off on it.

New episodes of Dexter: Original Sin season 1 release Fridays on Paramount+ with Showtime.