Dexter is an American television drama series. The series centers on Dexter Morgan (Michael C. Hall), a blood spatter pattern analyst for Miami Metro Police Department who also leads a secret life as a serial killer, hunting down criminals who have slipped through the cracks of the justice system. Set in Miami, the show's first season derived from the novel Darkly Dreaming Dexter (2004), the first of the Dexter series novels by Jeff Lindsay. It was adapted for television by screenwriter James Manos, Jr., who wrote the first episode. Subsequent seasons evolved independently of Lindsay's works.
Dexter aired on Showtime from October 1, 2006, to September 22, 2013. In February 2008, reruns (edited down to a TV-14 rating) began to air on CBS, although the reruns on CBS ended after one run of the first season. The series has enjoyed wide critical acclaim and popularity, including four straight Primetime Emmy nominations for Best Drama series in its first four seasons. Season 4 aired its season finale on December 13, 2009, to a record-breaking audience of 2.6 million viewers, making it the most-watched original series episode ever on Showtime at that time.
In April 2013, Showtime announced that Season 8 would be the final season of Dexter. The Season 8 premiere was the most watched Dexter episode with more than 3 million viewers total for all airings that night. The original broadcast of the series finale — shown at 9 p.m. on September 22, 2013 — drew 2.8 million viewers, the largest overall audience in Showtime's history.