Keith Marshall is a name that is not nearly as big as it might have been. Part of the Georgia Bulldogs 2012 recruiting class, he was the prize recruit fans were the most excited about, not fellow recruit Todd Gurley.
They went on to share carries in their freshmen seasons, with Marshall often looking the more explosive of the two. Take that in for a second. A running back more explosive then Todd Gurley. I can personally vouch for that as well, as I can recall Marshall ripping off long runs without problems.
And then Marshall fell off the face of the earth.