The Australian-born journalist was a pioneer in broadcasting, widely credited with shaping the modern, conversational style of phone-in radio.
Hayes began his UK career in the early 1970s, joining Capitol Radio before moving to LBC in 1976, where he established his distinctive phone-in format.
His extensive career included presenting BBC Radio 2's Good Morning UK! and BBC's Hayes Over Britain, for which he won a Gold Sony Award.
Colleagues and listeners have paid tribute to Hayes, remembering him as a legend and a giant of radio who was blunt and forthright yet knowledgeable and balanced.