[1] From Newbridge, County Kildare,[2] McKenna started playing darts at the age of 20.
In 1989, he reached the final of the WDF World Cup, losing to Eric Bristow.
It was at the 1990 BDO World Darts Championship where McKenna become notorious within the game, as the man on the receiving end of the first nine-dart finish at the World Championship, achieved by Paul Lim of the United States.
He returned to television in the 2002 PDC World Grand Prix, beating Cliff Lazarenko in the first round before losing to Phil Taylor.
McKenna tried to qualify for the 2008 BDO World Championship but lost in the very first round.