Ouko won two golds at the 1970 British Commonwealth Games, first in 800 m and then as a member of the Kenyan 4 × 400 m relay team. At the same year he was also a member of a Kenyan 4x880 yd relay team, which set the new world record of 7:11.6.
After his athletics career, Ouko worked as the secretary general in the Kenyan Amateur Athletic Association.
Ouko died 18 August 2019.
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