|Date of birth||7 October 1986|
|Place of birth||Kingston, Jamaica|
|Height||6 ft 2 in (1.88 m)|
|* Senior club appearances and goals counted for the domestic league only and correct as of 29 October 2012.
† Appearances (Goals).
Youth and Amateur
Williams played at a senior level for Santos FC and Harbour View FC in the Jamaican National Premier League. Williams was a key contributor for Harbour View helping the club capture the league title in 2010. After impressing with Harbour View FC Williams went on trial with Norwegian Division One side Mjøndalen IF during the 2010 season.
In early March 2011 Williams continued to explore overseas options going on trial with Major League Soccer side Toronto FC. He impressed coach Aron Winter and was signed by Toronto FC on 31 March 2011. Two days later Williams made his debut for Toronto as a second half sub for Nana Attakora in a 1-1 home draw against Chivas USA. On 19 July 2011 Aron Winter confirmed that Williams would miss the remainder of the 2011 season. On 20 June 2012 Williams made his return from injury as a second half sub for Danny Koevermans in a 3-3 away draw to Houston Dynamo.
Williams was released by Toronto on 15 November 2012.
Dicoy returned to Harbour View in 2013. 
Dicoy Williams made his international debut for Jamaica on 12 August 2009 in a scoreless draw against Ecuador played at Giants Stadium. Williams was called up to his first international tournament for the 2011 CONCACAF Gold Cup. He started the first game for Jamaica which ended in a 4-0 victory over Grenada, however in the second game of the group stage against Guatemala Williams hurt his knee forcing Theodore Whitmore to make a 10th minute substitution.
Harbour View FC
- Jamaican National Premier League: (1):2010
- "Gordon Goal Gifts Reds a Draw". Toronto FC. 2 April 2011. Retrieved 2 April 2011.
- "Reds Held As Houston Claws Back". Toronto FC. 20 June 2012. Retrieved 21 June 2012.
- "Williams hurt in Jamaica Victory". Toronto FC. 11 June 2011. Retrieved 16 June 2011.