|Screen Grab, Boston.com|
That was Bill Iffrig, a resident of Lake Stevens, Wash. He's 78 and this was his third Boston Marathon. He took up the sport in the 1970s after years of mountain climbing.
He got to his feet and finished the race.
He's another of those folks of a certain age who just keeps on running.
See this ESPN interview with him.
article about him from back home.