Criminal Minds has had numerous cast changes over its 21 years on air. Jason Gideon exited early in the drama show’s run, Elle Greenaway left the BAU in Season 2, Derek Morgan eventually departed to focus on family, and Aaron Hotchner disappeared from Criminal Minds after over a decade at its center. Even later additions have come and gone – not to mention that JJ and Emily Prentiss both left and returned – yet the BAU has always found a way to rebuild around whoever remains.
Spencer Reid has proved much harder to replace. Matthew Gray Gubler was part of Criminal Minds from its very first episode through its original series finale, but he didn’t return as a regular when Criminal Minds: Evolution launched back in 2022. Reid has since made a brief return, yet he’s still not back on the BAU’s weekly lineup. However, Criminal Minds may have solved that problem long before Reid disappeared with a character who joined the show eight seasons ago.

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Spencer Reid Was Criminal Minds’ Resident Genius
Every member of the BAU brings something different to a profile, but Reid was always the team’s most obvious intellectual weapon. Introduced as a young genius with an IQ of 187, an eidetic memory, and an ability to read at an extraordinary speed, Reid could recall obscure statistics, recognize patterns, and provide information on subjects ranging from mathematics and engineering to psychology. He also accumulated multiple degrees at an age when most people were still deciding what they wanted to do with their lives.
Those abilities obviously made Reid invaluable, though they weren’t the only reason he became such an important part of Criminal Minds. He was frequently the team’s most academically minded and empathetic profiler, capable of approaching an Unsub’s behavior from an angle nobody else had considered. Reid could produce an obscure fact to break open a case one week and then use his psychological understanding to get inside a killer’s head the next, and he frequently did. His awkwardness and inexperience in the field early on in Criminal Minds also made him stand out compared to traditionally imposing agents, like Hotch and Morgan.

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Reid was also part of some of Criminal Minds’ biggest storylines: Tobias Hankel kidnapped and tortured Reid in Season 2, which led to his struggle with Dilaudid. He developed a complicated relationship with Maeve Donovan before she was murdered in front of him, repeatedly crossed paths with Aubrey Plaza’s Cat Adams, and spent part of Season 12 imprisoned after being framed for murder in Mexico. His intelligence obviously made him an asset to the BAU, but Criminal Minds frequently turned the intelligence against him with Unsubs who could challenge him in a game of wits.
Reid was still in the BAU when Criminal Minds ended in 2020, so he never received a traditional departure storyline. Instead, Matthew Grey Gubler didn’t return when Paramount+ revived the series as Criminal Minds: Evolution in 2022, and within the story, Reid was still a part of the team but was just on assignment. Behind the scenes, showrunner Erica Messer said that scheduling prevented the actor from returning, and Reid only briefly returned in Season 18 to support JJ after she lost her husband, Will. So, while Criminal Minds hasn’t closed the door on Reid, someone else has inevitably had to step up and provide at least some of the expertise that Reid brought to every case.

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Criminal Minds Introduced Dr. Tara Lewis 8 Seasons Ago
Dr. Tara Lewis wasn’t created to replace Spencer Reid. When Aisha Tyler joined the show in Season 11, Reid was very much still part of Criminal Minds, and Tara initially helped fill the opening left by Kate Callahan’s departure. Tara’s background immediately made her different from most of the BAU, though; she was a forensic psychologist who had spent the past 12 years studying and interviewing criminals after the authorities had caught them, which led her to decide to help catch them herself.
Tara’s expertise gave her something very valuable to the FBI: the ability to get inside an offender’s head through direct psychological evaluation. Her introduction in “The Job” proves this, when she explains how she adopted the facial expressions, voice patterns, and cadence of a serial killer’s wife to manipulate him into revealing what she needed to know. The BAU then gained another profiler and a different academic specialist who could understand how dangerous minds worked.

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Tara Has Grown More and More Into Reid’s Role
During Reid’s Season 12 prison storyline, Tara visits Reid and acts as his psychiatrist, using a cognitive interview to help him reconstruct what happened in Mexico. When Reid becomes convinced he killed Nadia Ramos, Tara recognizes he may have manufactured the memory while desperately trying to explain what happened. Further questioning from Tara actually helps him remember there was a third person present, and the episode presents a great reversal: Criminal Minds’ resident genius needed someone else to help him navigate his mind, and Tara Lewis was the person to do it.
Since Reid’s departure, Tara’s importance has only grown. Evolution begins with Tara discovering the shipping container containing numerous victims that helped uncover the enormous, horrifying Sicarius network, and because the revival has leaned harder on ongoing psychological battles with offenders, Tara has thrived as the team’s forensic psychologist. Even her ability to understand and interrogate Elias Voit proves she steps somewhat into Reid’s shoes, especially as Elias becomes an unusual resource for the team after his capture. By Season 19, Tara is deliberately engaging Voit in conversations designed to understand how he thinks and use what’s inside his head to stop other killers.
Aisha Tyler described that storyline as a return to the foundation of the BAU: getting inside a serial killer’s mind, finding out what makes that person tick, and using that information to prevent more deaths.
Tara has also become the person the other BAU members turn to when the psychological pressure of the job becomes too much to bear. During the Gold Star investigation, Rossi eventually admits to Tara that he is experiencing intrusive visions of Voit, which she recognizes as trauma and suggests a way to confront it. It may not be the kind of encyclopedic deduction Reid would have delivered, but it fills the intellectual role the team needs. Sure, Tara isn’t a carbon copy of Reid, and nor should she be. She doesn’t possess an endless knowledge of obscure facts or an awkward personality, but she has Reid’s psychological expertise, academic background, and ability to make sense of complicated minds that allow her to occupy the same role Reid once did.
The best part is that Criminal Minds didn’t need to scramble for a new character to maintain the team dynamic once Reid stopped appearing regularly. Tara has been a part of the team for a while, and since her introduction eight years ago, Criminal Minds has increasingly made her expertise central to the team’s work. As many fans know, Spencer Reid is irreplaceable, but at least Tara fills the intellectual and psychological space he left behind.

Release Date
September 22, 2005
Showrunner
Erica Messer
Directors
Félix Enríquez Alcalá, Rob Bailey, Matthew Gray Gubler, Joe Mantegna, John Gallagher, Douglas Aarniokoski, Guy Norman Bee, Larry Teng, Nelson McCormick, Alec Smight, Charles S. Carroll, Rob Spera, Charles Haid, Diana Valentine, Rob Hardy, Tawnia McKiernan, Bethany Rooney, Karen Gaviola, Sharat Raju, Thomas Gibson, Aisha Tyler, Anna Foerster, Gloria Muzio, John Terlesky
Writers
Bruce Zimmerman, Virgil Williams, Edward Allen Bernero, Janine Sherman Barrois, Chris Mundy, Simon Mirren, Debra J. Fisher, Kimberly A. Harrison, Jay Beattie, Dan Dworkin, Karen Maser, Oanh Ly, Stephanie Sengupta, Aaron Zelman, Kirsten Vangsness, Erica Meredith, Andi Bushell, Holly Harold, Alicia Kirk, Jeff Davis, Randy Huggins, Edward Napier, Jayne A. Archer, Chikodili Agwuna



