Johnny joined Coronation Street as businessman Mike Baldwin in 1976.
The character was involved in one of the ITV soap’s most famous storylines ever in the 1980s, when Mike embarked on an affair with Dierdre Barlow, who was played by the late Anne Kirkbride.
Their affair was revealed to Deirdre’s husband Ken in 1983, setting up a long-running rivalry between Mike and Ken.
Johnny left Coronation Street after 30 years on the cobbles in 2006.
Mike was killed off while living with Alzheimer’s Disease, suffering a heart attack and collapsing in the street, where he died in Ken’s arms.