Desire

Desire (aka Mona) was the titular villainess in Desire, the Vampire (alternately titled, I, Desire).

She was played by Barbara Stock.

Desire was a vampiress who had been prowling the dark streets of various towns before arriving in Los Angeles, in the guise of a nurse named Mona. She worked at the same hospital as the main character, David Balsiger, who worked as a coroner's assistant, and she came in physical contact with David at one point when she attacked him. After his encounter with the vampiress and learning more about her from an ex-communicated priest named Paul, David encounters Mona as he's walking down the street. She drives him to her house, and it is there that Mona starts to come on to him before she heads upstairs to change. Mona slowly comes down in a black gown and continues seducing David, who resists her. At this point, Mona continues following him and eventually reveals herself to David as the evil Desire when her vampire fangs elongate. Desire manages to trap David on a balcony, but when she leaps towards him, she falls to her death.

Trivia

 * Barbara Stock later gained more fame for her appearance on Seinfeld as the Scam Woman in Season Three's "The Subway." Her co-star, David Naughton, appeared two episodes earlier in "The Red Dot."