Runners start the 2012 Chicago Marathon Sunday, Oct. 7, 2012. With 42-degree temperatures at the start, the conditions were good for a race marked by tragedy and mishap in recent years.

ASS0CIATED PRESS

Tsegaye Kebede of Ethiopia, crosses the finish line to win the 2012 Chicago Marathon Sunday, Oct. 7, 2012.

ASS0CIATED PRESS

Atsede Baysa of Ethiopia right, edges out Kenya's Rita Jeptoo left, to win the 2012 Chicago Marathon Sunday, Oct. 7, 2012.

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Josh Cassidy of Canada, crosses the finish line to win the wheelchair division of the 2012 Chicago Marathon Sunday, Oct. 7, 2012.

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Atsede Baysa of Ethiopia right, edges out Kenya's Rita Jeptoo left, to win the 2012 Chicago Marathon Sunday, Oct. 7, 2012.

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Tatyana McFadden crosses the finish line to win the women's wheelchair division of the 2012 Chicago Marathon Sunday, Oct. 7, 2012.

ASS0CIATED PRESS

Runners start the 2012 Chicago Marathon Sunday, Oct. 7, 2012. With 42-degree temperatures at the start, the conditions were good for a race marked by tragedy and mishap in recent years.

ASS0CIATED PRESS

Tsegaye Kebede of Ethiopia, celebrates after winning the 2012 Chicago Marathon Sunday, Oct. 7, 2012.

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Runners start the 2012 Chicago Marathon Sunday, Oct. 7, 2012.

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Tsegaye Kebede back, celebrates with fellow Ethiopian Feyisa Lilesa (6), after Kebede won first place and Lilesa finished second in the 2012 Chicago Marathon Sunday, Oct. 7, 2012.

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Runners leave the starting line during the 2012 Chicago Marathon Sunday, Oct. 7, 2012.

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Tsegaye Kebede of Ethiopia, celebrates after winning the 2012 Chicago Marathon Sunday, Oct. 7, 2012.

ASS0CIATED PRESS