Mario Hunt is a recurring character in Blue Bloods. He makes his first appearance in Episode 21, "New Rules", of Season 5 where he is a suspect in the murder of Donald Kent and his wife, Maggie Kent.
Unable to collect evidence to keep Hunt in custody, he is released and goes into hiding. In Episode 22, "The Art of War", Danny finds Mario Hunt by wiretapping his girlfriend's phone.
Mario Hunt returns in Season 7, "In and Out" as the leader of the Warrior Kings. Mario wants an early release in exchange for ending a gang war.