Gwynne was part of the Sky Sports commentary team for the inaugural world darts championship under the WDC banner in 1993.
The highly-respected sports broadcaster previously reported on darts for radio after moving from his original career as a school teacher.
Gwynne spent the next two decades calling some of the most memorable moments in darts. He retired in 2013 after covering 20 World Championships and 20 World Matchplays.
The PDC Hall of Fame member also wrote for Darts World magazine and worked with the Darts Regulation Authority.
Away from darts, Gwynne reported on football for the Soccer Saturday programme and also wrote his 'Soccer Satisfied' book which was published in 2020.
He also covered cricket, rugby league and speedway over a legendary career in the industry.
"John was a respected and popular figure in darts and across sports media and this is a sad time for all who knew him," said PDC Chief Executive Matt Porter.
"As part of the original Sky Sports commentary team alongside Sid Waddell and Dave Lanning, John's distinctive voice was part of the soundtrack to the PDC's formative years and they formed an iconic trio.
"John was hugely passionate about the sport of darts and made a great contribution at all levels during his career.
"We send our condolences and sympathies to John's family and friends."