running his first marathon for a charity called champions for children. this picture of him was taken at the finish line. just seconds after he crossed. >> amy was ten feet from the first explosion. >> his wife, amy, was so very close, but not injured. >> that doesn't seem to make any sense when the person who was standing beside me in boston was so maimed. >> meanwhile, amy had no idea where her husband was. and grew panicked when she couldn't reach him on his cell. >> for an hour, it was the worst hour of my life. i didn't know if he was dead or alive. >> amy went back to her hotel. >> all the way up the elevator, i thought dear lord, just let him be there. i opened the door to our hotel room and i thought my god, there he was. the not knowing was the worst things. on the next day, wednesday, joe had a business trip so he drove from austin to dallas. after a few hours, he started