Striker who joined Inverness Caledonian Thistle in 2011 and became a member of Northern Ireland's national team in 2013.
He began his professional career with Leicester City in 2007 after spending two years in the club's youth system.
He scored 13 goals in 74 appearances for Northampton Town between 2009 and 2011.
He was born in Corby, England. In 2015, he awarded his father, Billy McKay Senior, Clubman of the Year.
He became teammates with fellow striker Will Grigg on the Northern Ireland national team in 2013.