Criminal Minds: Evolution Season 19 Episode 4 is an intense blend of psychological horror and police procedural as the BAU attempts to catch a killer obsessed with medieval concepts of sin and punishment. Meanwhile, in the shadows, another threat is growing as Voit’s mysterious admirer inches closer to being a dangerous copycat murderer.# A Heresy Obsessed Killer
The episode opens with a horrific attack on Charles and Mary Tolson. The couple are imprisoned by an unknown man and are put through what seems to be a twisted religious trial. The attacker demands confessions, talks about heresy and then, when her answers don’t satisfy him, kills Mary brutally.
The BAU starts to investigate and they start to see strange things connecting the crime scenes. The unsub leaves behind salt, a symbol historically tied to purification and cleansing rituals. Combined with witness testimony, the team begins to suspect the killer believes he is on a moral crusade.
Meanwhile, Emily Prentiss and Tara Lewis continue to analyze the mysterious manuscript sent to them by one of Elias Voit’s followers. The document is perfectly presented, which points to the person being very organized and having some obsessive tendencies. The team suspects that the person is suffering from strong obsessive compulsive behaviors.# BAU Connects the Dots
Emily and Tyler Green’s focus turns to the Colorado Springs murders, with David Rossi. They reconstruct the attacks, look at how the killer went about his business and they discover that the victims were basically tried in absentia before they were killed.
But the investigation takes a huge turn when the team discovers that all the victims had been involved in infidelity. Soon historical references guide them to the Malleus Maleficarum, a medieval text notorious for directing witch hunts and religious persecution. In the warped universe of the unsub, adultery is a heresy that deserves punishment.
The agents start to suspect the killer’s motivations come from personal trauma. It’s not so much about religion but him projecting his own emotional wounds on other people.# Victim Number Two Down
As the BAU races to identify their suspect, another family is attacked by the killer. In a disturbing encounter, a woman attempts to challenge his beliefs by asserting that she is a witch. But the unsub is not acting as anyone would expect him to, and murders her husband, showing just how unpredictable and dangerous he has become.
The team watch the body count rise and the killer has intimate knowledge of each family’s routines. This is a key piece of information, as Tyler notes that the unsub seems to know exactly when the children will be out of the house, allowing him to strike without directly involving the children.#Mystery deepens over Voit’s fan
Away from the main case, another investigation begins to form.
The BAU receives more materials from Voit’s anonymous admirer, including photos of a woman named Laura Boyd. The images initially steer investigators to Laura’s ex-boyfriend Lance Kingston, a clear suspect given his history of stalking and erratic behavior.
Tara has a simple but effective test, however. She notes Lance’s response to a leaking pen and confirms he doesn’t have the obsessive qualities of the true fan. The evidence is clear. Someone stole the photos, hacked Lance’s devices and framed him as a suspect.
The revelation makes things a lot more interesting. The fan isn’t just obsessed with Voit, he’s methodical about studying criminal investigations and learning how not to get caught.# Sean Fincher Unveiled
Eventually Penelope Garcia cracks the case of the killer terrorizing Colorado Springs. The unsub is Sean Fincher, a substitute teacher who taught children associated with each victim.
His tragic past fills in the missing piece of the puzzle. Sean was raised in a very disturbed household where his father murdered his mother. More recently his own marriage ended when his wife left him and took their son. It appears these incidents triggered his violent spiral.
Sean’s final targets are Brenton and Delores Woodrow, a couple attempting to mend a broken relationship. In his twisted trial, both confess to past betrayals and personal failures. Delores believes they can be forgiven for their mistakes, but Sean refuses to be redeemed.
Tyler intervenes and shoots him dead, ending the killing spree before he can kill another victim.# JJ and Henry Make a Deal
JJ’s personal storyline is also developed in the episode.
When her son Henry starts to avoid conversations about his future, JJ finally takes action. Henry says part of his reluctance to go to college was the concern over his mother.
The emotional conversation gives them both a chance to be honest about what they’re afraid of. By the end of the episode, Henry agrees to go to college and JJ assures him she will be fine on her own.# Ending Explained: What Is Voit’s Fan Really Up To?
The case of Sean Fincher has been resolved, but the biggest threat in the episode is still on the loose.
Finally, Voit realizes Laura Boyd was never really the fan’s target. Instead she was an obstacle which allowed the admirer to collect useful information about the investigative techniques of the BAU. The fan has been learning law enforcement procedures in real time by hacking Lance Kingston and watching the fallout.
The last moments of the episode show how dangerous this person has become. Lance is kidnapped and placed unconscious inside a vehicle, heavily implying he’ll be the fan’s first murder victim.
The implications are chilling. He doesn’t want to admire Elias Voit, he wants to be better. He wants to be a highly calculated serial killer. One who can avoid capture.# Assessment
Episode 4 does a decent job of balancing two good storylines. Sean Fincher’s medieval-inspired killing spree is a gripping standalone case rich with historical references, psychological depth and authentic tension. Even after viewers discover who he is, the investigation remains engaging because the team works to understand his motives and figure out his next move.
But the bigger story of Voit’s admirer is arguably even more fascinating. The writers maintain the suspense of a villain still unseen but more dangerous than ever. Every clue points to the fact that this individual is carefully planning for a long campaign of violence.
The episode also has some great character moments, especially for Tyler Green and JJ. Tyler continues to find his place in the BAU and JJ’s scenes with Henry give the episode emotional grounding amid the darker subject matter.
Episode 4 ends with a chilling revelation for viewers: Sean Fincher may be out of the picture, but a much smarter, much more methodical killer is only just beginning.