“He will be sorely missed and always treasured,” Hesseman’s manager says.

“He will be sorely missed and always treasured.”

Hesseman starred as the hippie disc jockey on the CBS sitcom during its four-season run between 1978 and 1982.

Howard Hesseman attends the IMF 11th Annual Comedy Celebration at The Wilshire Ebell Theatre on November 4, 2017 in Los Angeles, California.

Howard Hesseman.Rodin Eckenroth/WireImage

Hesseman was also a three-timeSaturday Night Livehost.

“Impossible to overstate Howard Hesseman’s influence on his and subsequent generations of improvisors,” McKean wrote.

He was a friend for 50 years."

Howard Hesseman in WKRP Cincinnati

Howard Hesseman as Johnny Fever in ‘WKRP in Cincinnati’.Courtesy Everett Collection