McDermott is also known for his roles in the four seasons (first, second, eighth and ninth) of the FX horror anthology series "American Horror Story", subtitled ', ', ', and ' portraying Ben Harmon, Johnny Morgan and Bruce, respectively. He also starred as Lt. Carter Shaw on the TNT series "Dark Blue"; in two short-lived CBS dramas, "Hostages" and "Stalker"; and in the 1994 remake of the film "Miracle on 34th Street". As of 2021, he is set to star in the upcoming ' spinoff, ' alongside former SVU star, Christopher Meloni premiering April 1st.