"Criminal Minds" has delivered some of the most heart-wrenching and gut-wrenching episodes, with cases that leave lasting emotional scars on both the characters and viewers. One of the most tragic episodes, True Knight, revolves around Johnny McHale, a comic book artist who, driven by severe PTSD, unknowingly goes on a killing spree to avenge the death of his fiancée, only to be left haunted by the memories. The pain of losing loved ones and battling inner demons makes this and many other episodes deeply poignant, keeping fans on the edge of their seats.