Diane Riley, Leading New York Theatrical Agent and Partner at Harden Curtis Kirsten Riley, Dies at 52

Diane Riley Passes Away After Surgical Complications

Diane Riley, a highly regarded New York theatrical agent and partner at Harden Curtis Kirsten Riley, died unexpectedly on September 16 in Asbury Park, New Jersey, at the age of 52. According to her family and agency, her death resulted from complications following surgery. Riley had been managing a series of health challenges over the past year and a half, with her condition worsening in the months leading up to her passing. A celebration of her life is scheduled for Friday afternoon, October 30, at the New World Stages theater in Manhattan.

A Career Built on Talent and Mentorship

Riley’s career in the entertainment industry began at the Goodspeed Opera House in Connecticut, where she served as an assistant company manager. She later transitioned to the Roundabout Theatre Company as a casting assistant. In 1997, she joined Harden Curtis Associates, working closely with founders Mary Harden and Nancy Curtis. Her dedication and expertise led to her promotion to agent, and in 2017, she and fellow agent Michael Kirsten were named partners, prompting the agency to rebrand as Harden Curtis Kirsten Riley.

Throughout her career, Riley represented a distinguished roster of actors, including Lisa Emery, Curtiss Cook, Andy Mientus, Christiane Noll, and Thom Sesma. She was widely respected in the theater community for her fierce loyalty to her clients, sharp intellect, and vibrant personality.

Leadership and Community Involvement

Beyond her agency work, Riley served as the Vice President of the board of directors for the National Association of Talent Representatives (NASTR). Her colleagues remembered her for her infectious energy, dry wit, and generous spirit. Born in Indianapolis and raised in Orlando, she attended Dr. Phillips High School, where she was classmates with future music and entertainment figures such as Joey Fatone, JC Chasez, DJ Khaled, and Luis Fonsi. She is survived by her husband, DJ McDermott, her father, Gary Riley, and her brother, Evan Riley.

Verified Facts and Source Verification

The details of Riley’s career, her passing, and the upcoming celebration of life have been officially confirmed by her family and agency via an announcement published on Deadline. Readers seeking to verify these details or view the original tribute can access the official source at [Deadline's announcement](https://deadline.com/2026/10/diane-riley-dead-1237207368/). The exact medical details of her prior health issues and the specific surgery she underwent remain private, as her family has not released a comprehensive medical history.

Industry Impact and Practical Implications

The passing of Diane Riley represents a significant loss for the New York theater community. As a partner at one of the region's prominent talent agencies, her representation of key stage actors influenced casting dynamics on Broadway and Off-Broadway. Clients represented by Riley may now need to transition to other agents, and the agency is expected to reorganize its talent roster to maintain continuity.

Comparatively, the loss of established theatrical agents often prompts shifts in representation, though the long-term impact on the actors' careers depends on the agency's ability to seamlessly integrate her clients into other experienced representatives. Readers and industry professionals can check the official agency website or trusted theater publications for updates regarding the transition of her client list and the future leadership of Harden Curtis Kirsten Riley.