Magic City alumna Kelly Lynch has landed a key role in Mr. Mercedes, AT&T Audience Network’s upcoming drama series.

Based on Stephen King’s 2014 book of the same name, Mr. Mercedes follows a demented killer who taunts a retired police detective with a series of lurid letters and emails, forcing the ex-cop to undertake a private, and potentially felonious, crusade to bring the killer to justice before he is able to strike again. David E. Kelley is writing the adaptation, which is being produced by Sonar Entertainment, and Jack Bender (Lost) is set to direct. Both executive produce along with Temple Hill Entertainment’s Marty Bowen and Wyck Godfrey. Lynch will play Deborah Hartsfield, Brady Hartsfield¹s complicated mother. Despite her troubles, Deborah tries to have a normal relationship with her deeply troubled son but she is rarely successful.

Lynch, who played Meg Bannock in Starz’s Magic City, most recently appeared in indie film Oren Shai-directed The Frontier, alongside Liam Aiken and Izabella Miko. Her other recent films include Gregg Araki’s Kaboom, Passion Play which was written and directed by her husband Mitch Glazer and Glass Chin with Corey Stoll and Billy Crudup. She also recurred on the CW’s 90210. Lynch is repped by Primary Wave and attorney Mark Temple.