I can’t really explain it.

How did they manage to keep me interested in a likable serial killer for so long?

… Showtime … October 1, 2006 to September 22, 2013. A total of 96 episodes of Dexter were broadcast over eight seasons. …

The series follows the life of Dexter Morgan (Michael C. Hall), a Miami Metro Police Department blood pattern analyst with a double life. While investigating murders in the homicide division, Dexter hunts and kills murderers and criminals who have escaped the justice system …

Click PLAY or watch a Season 1 trailer on YouTube.
http://www.youtube.com/watch?v=R-1wCemETeA

I was impressed with the final episode. Not at all what I expected to happen.