Tim Donnelly, Actor on ‘Emergency!,’ Dies at 77 He played firefighter Chet Kelly for six seasons on the 1972-77 NBC action series. https://doyouremember.com/wp-content/uploads/2021/09/tim-donnelly.jpeg https://www.hollywoodreporter.com/tv/tv-news/tim-donnelly-dead-emergency-actor-1235019061/