At 21, Wanjiru was the youngest gold medal winner in the marathon at an Olympics since 1932.
After his Beijing triumph, Wanjiru has set about dominating the marathon distance, claiming a number of victories in races.
It helped him be crowned the men's champion in the 2009 and 2010 world marathon majors series.
In recent years, Wanjiru has had a number of troubles.
In December 2010, Wanjiru was charged with making death threats against his wife and illegally possessing an AK47 rifle. At the time, prosecutors alleged Wanjiru was drunk when he made the threats.
Wanjiru pleaded innocent to the charges during a court appearance in his home town of Nyahururu. His wife later dropped the charges, though he still faced a weapons charge.
Wanjiru was forced to withdraw from the London Marathon, a premier running event ahead of the 2012 Olympics, after he was involved in an automobile accident in January in Kenya.
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