At the 2009 Jamaica National Championships, Blackwood tried for a spot at the 2009 World Championships in Athletics, but was disqualified running outside his lane in the semi-finals of the 400 m.[1] In August, he announced his retirement from the sport.[2]
Medal upgrades
In 2009 American sprinter Jerome Young admitted to doping during the period of 1999 through 2003. The IAAF gave Young a life ban as a result and annulled his performances.[3] This had a significant effect on Blackwoods career: Jamaica were elevated to World Indoor 4 × 400 m Relay gold medal, where Blackwood ran the third leg.[4] He was given the 400 m bronze medal at the 2003 World Championships,[5] as well as being moved up to the top spot at the 2003 World Athletics Final.[6]