With Desmond Harrington returning as a series regular, Dexter: Resurrection now has the perfect chance to resolve a fan theory that exists since 2010.
Throughout the years, many theories about Dexter have been shared by fans, but only a few have really stood the test of time. The ones people keep coming back to are usually about Dexter Morgan himself, especially the idea that someone close to him found out who he really was... and chose to look the other way.
One of the most persistent theories is about Joey Quinn, portrayed by Desmond Harrington. Introduced in Season 3 back in 2008 as a replacement for James Doakes at Miami Metro, Quinn didn’t actually take long to grow suspicious of Dexter. His early attempts to build a friendship (mainly because of Debra) were repeatedly shut down, and that only made Quinn more certain that something felt off.
Fast forward to today, and Quinn is still part of Miami Metro, now serving as Lieutenant. After two brief appearances in Dexter: Resurrection Season 1, it’s been officially confirmed that Harrington will return for Season 2 in a much larger role as a series regular, just like in the original show. This gives the story a great chance to finally deal with something fans have been wondering about for years.
At this point in Dexter: Resurrection, it’s actually clear that Quinn (and every living original character) still believes Dexter is dead. Following the events of Hurricane Laura, only the wreckage of his boat, the Slice of Life, was found.
Angel Batista was the only one who learned the truth through Angela Bishop, but he kept it to himself, determined to bring Dexter to justice personally, a plan that never really came to fruition. Now, with Quinn stepping back into focus, the story has the perfect chance to answer one big question: did he know all along?
To understand why this theory refuses to die, it helps to go back to Season 5. After Rita’s murder, Quinn’s suspicions intensified dramatically. He actually investigated Jonah Mitchell and used a sketch of “Kyle Butler” to try to connect Dexter to the Trinity Killer. When that didn’t lead anywhere, Quinn asked for help from Stan Liddy, a corrupt narcotics cop played by Peter Weller, to surveil Dexter and dig up evidence.
How the 'Quinn Knows About Dexter' Theory Originally Began
Even though they worked together at first, Quinn eventually pulled away from Liddy because he felt guilty, especially because of his relationship with Debra. But Liddy continued the investigation alone and eventually gathered enough evidence to confront Dexter. That confrontation ended with Dexter killing Liddy, leaving behind a mess that would soon circle back to Quinn.
When Liddy’s body was discovered, Quinn became a suspect due to their frequent phone calls and a drop of blood found on his shoe from when he got close to Liddy’s van. Realizing how much Quinn meant to Debra, Dexter actually stepped in and messed with the blood results, clearing Quinn of suspicion. When Quinn later thanked him, Dexter pretended that he didn’t know what he’s talking about.
That moment is what really started the “Quinn knew” theory.
From that point forward, Quinn’s behavior toward Dexter noticeably changed. He stopped investigating, stopped asking questions, and seemed to ignore anything strange. This continued all the way to the Season 8 finale, when Quinn watched Dexter kill Oliver Saxon on a security feed inside Miami Metro.
His reaction was plain and simple: “It’s obviously self-defense.” That line became very popular with fans and helped turn both Quinn and Harrington into unexpected favorites.
For more than ten years, fans have argued about whether Quinn truly understood that Dexter wasn’t who he seemed to be, and simply chose to stay quiet. Now, Dexter: Resurrection Season 2 is expected to finally give a clear answer and confirm the theory, since at this point, it’s actually something that can no longer be ignored.