A dream turns to dustTo play this audio please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoLaycock, Kate04/20/2013April 20, 2013For runner Shannon Leach, competing in the 2013 Boston Marathon was a dream come true. Then that dream turned into a nightmare.https://p.dw.com/p/18JdqAdvertisement Shannon Leach is a nurse and amateur runner.