[s13e15] - Annihilator

: Season 13 notably integrated Daniel Henney as Matt Simmons, a regular cast member following the cancellation of the spin-off Criminal Minds: Beyond Borders , as noted on Wikipedia .

is the 15th episode of the 13th season of the long-running police procedural Criminal Minds , which originally aired on March 7, 2018. Episode Overview [S13E15] Annihilator

In this episode, the Behavioral Analysis Unit (BAU) travels to St. Louis to investigate a brutal quadruple homicide involving a group of roommates. The case is complicated by the presence of Linda Barnes, the FBI's Assistant Director of National Security, who joins the team to oversee their work and evaluate their performance according to TheTVDB and Rotten Tomatoes . Key Features and Plot Points : Season 13 notably integrated Daniel Henney as

: The team hunts for an "annihilator"—a type of killer who targets specific groups or families—after four young professionals are found murdered in their shared home. Louis to investigate a brutal quadruple homicide involving

: This episode is part of a major story arc involving Linda Barnes (played by Kim Rhodes), whose bureaucratic interference threatens the stability and future of the BAU.