Vanessa Gayle is a character in DEXTER. Vanessa is what Detective Angel Batista calls a big time prosecutor, and her husband Alex Gayle claims that she put away a lot of criminals in her time. Unfortunately Vanessa is found dead in her bathtub, apparently having shot herself though her husband refuses to believe it. Dexter Morgan connects her death to that of two women who killed themselves the previous year, Meghan Dowd and Carolyn Jillian realizing that they all visited the same therapist Dr. Emmett Meridian. Dexter schedules an appointment with the Doctor using the alias Sean Ellis, ultimately discovering the truth behind the women's deaths. Dr. Meridian prescribed each woman medication that weakened their minds, then abruptly ended the course of the medications, then, manipulating the women in their depressed ststes, he was able to convince each woman to kill herself with a handgun. Dexter later catches and kills Meridian, avenging the three women.
Humorously, Dexter refers to the three as the "Suicide Sisters".