Mariana is playing the recurring character of Professor Carissa Porter in two episodes from Season 6 of Showtime's Dexter, starting with The Angel of Death airing on Sunday 30th October 2011 at 9pm ET/PT.

Mariana plays Professor Carissa Porter, a professor at Tallahassee University. Mariana's first appearance in S6 is in Episode 5 entitled The Angel of Death and continues to Episode 6 Just Let Go on November 6th.

The Angel of Death:- With the help of his newfound friend Brother Sam, Dexter wonders if there is light within him to counter the darkness, while the search for the Doomsday Killers takes him in a new direction; Batista and Quinn pay a visit to the university where Professor Gellar taught; due to departmental regulations following the shooting, Debra is forced to begin therapy.

Just Let Go: - Dexter's case turns personal, while Debra's new duties as a lieutenant leave her feeling overwhelmed. She also discovers Quinn made a professional faux pas.

Below are screenshots of Mariana as Carissa from the episodes.