Showtime has released a behind-the-scenes featurette titled “From Cop to Killer” to promote the final season of its hit serial killer drama “Dexter,” premiering June 30.

The clip examines Debra Morgan’s (Jennifer Carpenter) rise in Miami homicide and what appears to be her imminent downfall now that she has committed murder to protect her brother Dexter (Michael C. Hall).

Peep it: