Dexter: Why Lumen Was Written Out After Season 5

Dexter's Lumen was introduced as an intriguing new character in season 5 before making a surprising exit at the end of the season. Dexter deals with the titular Dexter Morgan, a vigilante-type serial killer who also works for the Miami Metro Police Department as a blood-spatter analyst. Over 8 seasons, Dexter followed a strict code given by his police officer father to only kill other murderers that deserve it, evade getting caught, and avoid emotional attachment with victims - a rule he broke through his intimate involvement with Lumen.

Julia Stiles signed on to Dexter in season 5 as Lumen, a role that earned her Emmy and Golden Globe nominations. The addition of Lumen also came in the first season after Dexter's wife Rita was shockingly killed in the season 4 finale. In many ways, Lumen felt like a perfect character to fill that role in Dexter's life. That made it all the more surprising when Lumen left the show so quickly, never to return again. While many fans of the show were sad to see her go, Lumen's exit was always planned and made sense for her character.

Who Was Lumen In Dexter?

Dexter Helped Lumen On Her Personal Mission Of Revenge

Lumen is introduced in Dexter season 5's first episode. When Dexter tracks a serial killer named Boyd Fowler to his home and kills him, he finds Lumen, one of Boyd's would-be victims. After Dexter helps her to regain her strength and it becomes clear that she is not going to turn him into the police for the murder of Fowler that she witnessed, she reveals that Fowler was a small part of a bigger evil entity.

Lumen reveals that she was the victim of a group of men, eventually known as the Barrel Girl Gang, who capture, abuse, torture and kill women before disposing them in barrels. Though Lumen escaped the group, she suffered greatly at their hands and wanted revenge. When Dexter told her about his "dark passenger" and his code of killing, she became his sidekick in taking down the group of killers one by one. Throughout their work together, Dexter and Lumen fall for each other and begin a romantic relationship as well, with Dexter feeling a kinship he has rarely experienced.

Lumen Left To Show Dexter Could Leave His Life Behind

Lumen Received A Rare Optimistic Ending In The Series

Julia Stiles as Lumen Pierce holding knife and looking downward in Dexter.

Lumen felt like the most compatible of Dexter's love interests and there was a mutual bond that formed between them. However, after killing the last of the Barrel Girl Gang members, Lumen decided that she could leave this life of violence behind now. Unfortunately, that meant having to leave Dexter as well. Dexter executive producer Sara Colleton told EW there was always a possibility for Lumen to return because she’s alive and her relationship ends amicably with Dexter.

Lumen’s ending implies that Dexter can stop killing, but his darkness has obviously consumed him for much longer than Lumen’s.

However, the reasoning behind her leaving was that they wanted to show that someone can have their dark passenger for a time and abandon it to lead a relatively normal life. Lumen’s ending implies that Dexter can stop killing, but his darkness has obviously consumed him for much longer than Lumen’s. Lumen’s arc left Dexter with an optimistic future for himself and Harrison, considering Dexter can be seen for who he truly is and still be loved and Harrison doesn’t have to be doomed to a life of darkness after his trauma.

Lumen Could've Returned For New Blood

Lumen Could Have Been Dexter's Chance At A Normal Life

Michael C Hall as Dexter Morgan looking worried in the woods in Dexter: New Blood — Michael C Hall as Dexter Morgan in Dexter New Blood

While Lumen never did appear on Dexter again after leaving at the end of season 5, the real missed opportunity for her return was in the sequel series Dexter: New Blood. Following the much-derided ending of Dexter in which he fakes his own death to live as a lumberjack in the woods, New Blood was seen as a way for the show to make up for that lackluster conclusion. The sequel series found Dexter living under a new name in a small community only for his dark passenger to become needed again.

However, the sequel series set up a perfect scenario for Lumen's return. By the end of the series, Lumen was one of the few people who knew about Dexter's dark passenger. It would make sense that, if he was going into hiding, he might try to reconnect with the only person who truly understood him.

Lumen's involvement in New Blood could have been very interesting, with them living a quiet life together with her happy to leave the violence behind and him struggling to suppress those desires. While the sequel series was seen as an improvement to Dexter's original ending, Lumen's presence could have made it even better.

Writing Lumen Off Was A Mistake

Dexter Lost One Of Its Most Interesting Characters (And Suffered For It)

Dexter has a devoted fanbase, and managed to land both a follow-on revival in the form of New Blood and the prequel Original Sin after its conclusion. However, the Showtime drama also has many aspects that are regularly criticized, even by fans. Chief among these is that Dexter lost many of its best characters far too quickly. Alongside the likes of Frank Lundy, Doakes, and Rita, Lumen is one of the most often cited Dexter characters fans wanted to see more of, and think the show was too keen to write off.

Throughout Lumen's time on the show, it was clear that having another character with a Dark Passenger was a key plot device that Dexter sorely needed.

While Lumen leaving Dexter in season 5 helped illustrate that he wasn't a slave to his Dark Passenger and could walk away from his life of serial killing if he truly wanted to, this alone wasn't justification for her leaving the show. Even though it proved an important point about Dexter's character, the show still suffered greatly because of losing Lumen. What's more, her presence wasn't missed because of her romantic ties to Dexter, either.

Throughout Lumen's time on the show, it was clear that having another character with a Dark Passenger was a key plot device that Dexter sorely needed. It provided unrivaled opportunities for Dexter to reflect on his actions and life choices, his activities as a serial killer, and whether his own Dark Passenger truly was the uncontrollable beast that only Harry Morgan's code could keep in check. When Julia Styles left the show, this treasure trove of narrative potential left with her, and there's a strong argument to be made that Dexter never truly recovered from this.

There was also the fact that Lumen and Dexter's relationship could have ended on a much more dramatic note. For example, rather than Lumen showing Dexter that it was possible to walk away from his own Dark Passenger, it might have been more satisfying if Dexter had awakened an unquenchable urge within Lumen herself. This would have forced him to reconcile with the impact his nature had on others, and could have made for some fascinating character development.

The tease that Lumen was still out there and alive when she was mentioned in the season 7 episode "Do the Wrong Thing" only cemented the view that Dexter wrote off Julia Styles' character too quickly. Not only did it create a nostalgic pang for many viewers, but it also pointed out a key flaw in how her character arc ended. Despite his feelings for her, Lumen was a loose end for Dexter, and leaving her alive went against everything the show had established about his cold and calculated approach to covering his tracks.

Knowing someone was out there who knew his secret didn't fit Dexter as a character at all. The relationship he had with Lumen would have (and, realistically, should have) ended very differently if she had remained on Dexterfor longer.