He made his league debut on 13 December 2003 as a late substitute for Alex Tapp in a 1–0 defeat at home to Walsall.
After trial spells with clubs including Barnet, Yeovil Town and Dagenham & Redbridge, McKoy signed a contract until the end of 2008 with St Johnstone on 21 August 2008.
McKoy signed for Grays Athletic on 26 June 2009, along with Serge Makofo, Marcel McKie and Allan McLeod.
[15] McKoy made his debut against Everton at Goodison Park in a Third Round FA Cup tie, which Tamworth lost 2–0.
[16] McKoy resigned for Sutton United at the start of the 2012–13 season, and played nine times without being on the winning side.
[1] McKoy was arrested on 15 September 2013 on suspicion of match fixing while playing with the Southern Stars in the Victorian Premier League in Australia.