: Doyle carries a unique tattoo—a four-leaf Irish clover with a 'v' at the end of the stem—which Prentiss recognizes as a symbol of the "Valhalla" ship and his hidden sect of warriors. Prentiss Under Pressure
: The inclusion of innocent family members, such as the Cosenza's teenage son, highlights the personal nature of his mission. [S6E17] Altar-ed State of Mind
Doyle is more than just a typical unsub; he is a highly trained operative with a deep personal grudge. The BAU's profile reveals a man who is: : Doyle carries a unique tattoo—a four-leaf Irish