A cause of death was not disclosed, though the Los Angeles County Fire Museum confirmed the news via a tribute posted to their official Facebook page.
“It is with deep sadness that we announce the sudden passing of our friend, Tim Donnelly, this weekend. To all the Emergency! fans, we want you to know that he was very excited about coming to the Museum in January for the 50th Anniversary,” a spokesperson wrote. “Many of the Museum Board Members have great memories of Tim from our time on Project 51 and personal contact. To his daughter, grandchildren, and siblings, we offer our sincerest condolences.”
Donnelly was born on September 3, 1944, finding his first role in Don Siegel’s 1957 crime drama, Baby Face Nelson, and going on to enjoy a 27-year screen career.