The entertainer passed away at Blackpool Victoria Hospital on Tuesday, 28 April following a battle with cancer.
His agent confirmed the sad news in a statement to Sky News:
"It is with great sadness I announce the death of my friend and client Keith Harris whom I have known for well over 20 years and managed for the past 15 years.
"I spoke to Keith most days whether we had business to do or not. I think I laughed every single time we spoke. Keith was not only a technically great ventriloquist, he was also a gifted mimic and an extraordinarily funny man both onstage and off.
"Perhaps even rarer than that in showbiz, he was a thoroughly decent man, a great friend and a wonderful father and husband. The family have asked for privacy at this time."
Keith and Orville appeared on BBC's The Keith Harris show from 1982 to 1990. A song was also released, 'Orville's Song (I Wish I Could Fly)', which reached number 4 in the UK Singles Chart.
The duo were invited by the late Princess Diana to perform at Prince William's third birthday and then Prince Harry's third birthday.
For exclusive competitions and amazing prizes visit Reveal's Facebook page NOW!