English was well known for his work in music, television and on the stage, most notably his roles as Judas Iscariot in Jesus Christ Superstar in the 1970s and later as Pirate King in The Pirates of Penzance.
A statement from his talent representatives, Ambition Entertainment, said at the time of his passing he was surrounded by family members, including his four children, wife Carmen, sister Janet and brother Jeremy, as well as other close family members.
Late last month he was hospitalised due to “unexpected ill health”. His management postponed a number of shows in Tamworth and Dubbo that conflicted with his scheduled surgery.
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His former manager Peter Rix said he died after what was supposed to be a routine operation.
“They discovered problems with aorta valves, a lot of bleeding was involved,” Rix said.
Robert Rigby, the manager of English’s record label, said the sudden death had shocked everyone.
“Jon was truly an Aussie rock legend,” he said.
“This news has come as a very big shock to family and friends and of course the industry as a whole.
“Jon was not expecting anything more than a routine operation but due to complications unfortunately he passed away at almost midnight.”