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The Rookie: The Pentagram Killer, Explained
Jul 3, 2025
The ABC series The Rookie is a network police procedural focused on the life of a beat cop, a format the show reembraced in its seventh season. This means that the cases the characters work on each week can differ greatly. Still, The Rookie has no shortage of serial killers in its ranks, and Season 6's "Training Day" introduced a unique one: The Pentagram Killer. However, the case didn't play out the way longtime fans may expect.
In fact, the titular training day in The Rookie's fourth Season 6 episode has nothing to do with the new serial killer on the show. Rather, it follows Tru Valentino's Officer Aaron Thorsen after a near-fatal shooting, returning to duty in what was his last season as part of the cast. Paired with Eric Winter's Tim Bradford, the stern training officer puts him through a high-stress regimen designed to see if he's really over the trauma of nearly dying from both bullet wounds and complications after surgery.
On his first day back, Aaron Thorsen proves his mettle, cracking a murder-for-hire case and getting a punch in the face for his trouble. The rest of The Rookie's regulars work together to solve the murder of Cheryl Budny, whose body bears the signature mark of the Pentagram Killer. Nathan Fillion's Officer Nolan suggests that a new documentary inspired the killer to return or a copycat. Eventually, the identity of the Pentagram Killer becomes very straightforward, but the case itself is complicated and messy.
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