"dexter" Popping Cherry(2006) -

is the third episode of the first season of the American television drama series Dexter , which first aired on October 15, 2006. The episode is pivotal as it explores the origin of Dexter Morgan’s dark passenger by flashing back to his very first human kill—a nurse named Mary who was systematically poisoning her patients. Plot Summary

Harry discovers Mary is administering overdoses to her patients and gives Dexter "permission" to make her his first target, provided he follows the "Code". "Dexter" Popping Cherry(2006)

The episode's title refers to Dexter "popping his cherry" as a serial killer. Through flashbacks, we see: is the third episode of the first season