In addition to playing hockey, Mahoney was also a renowned lacrosse player, a Canadian football quarterback, and a softball pitcher.
In 1956, he became the first local native to play for the Peterborough Petes, and he served as captain of this junior "A" squad during the 1958 season.
[2][3] In 1963, Mahoney led the McMaster Marauders to become the first-ever Canadian Intercollegiate Athletic Union (CIAU) ice hockey champions, at the inaugural CIAU University Cup tournament, also winning the first ever tournament Most Valuable Player award.
[4] Although Mahoney never played pro hockey, he had a long coaching career, serving 16 years behind the bench with the McMaster University squads.
[5] In 1982, Mahoney was inducted into the Peterborough and District Sports Hall of Fame, for his combined achievements in both hockey and softball.