By John Brice Sam McGrath spent a half-dozen years at Duke, previously worked with JIm Knowles Sam McGrath, a college coaching veteran who spent the past seven seasons on David Cutcliffe’s Duke University staff, is headed to Ohio State. View the original article to see embedded media. Sources tell FootballScoop that McGrath, with a lengthy background on the defensive side of the ball, will join Buckeyes defensive coordinator Jim Knowles’ staff in Columbus, Ohio, in an off-the-field, senior analyst role. McGrath and Knowles previously worked together multiple seasons at Duke. Most recently, McG…