Per The Hollywood Reporter, Timothy David Donnelly was born on September 3, 1944, in Los Angeles. His mother, Eileen, was the daughter of actor Pat O'Malley, and his father, Paul, worked as the production vice president at Universal Pictures.
Tim made his onscreen acting debut in the film "Baby Face Nelson" in 1957. In addition to "Emergency!," he went on to star in 1978's "The Toolbox Murders" and several episodes of "Hawaii Five-O," "Project U.F.O.," "Vega$," and "The A-Team" (via IMDb).
Following the sad announcement of the actor's death, many fans took to social media to pay tribute. "Just saw that Tim Donnelly who played Chet on 'Emergency!,' has died" wrote one fan on Twitter. "While technically long before my time, as a teen I watched the show on reruns in the very early hours of the morning, years before I decided to be a paramedic. RIP," they added.
