By Zach Barnett Defensive coordinator Robb Smith is reportedly leaving the staff for personal reasons, and Mike Elko has already lined up a long-time lieutenant as his replacement. Duke is losing defensive coordinator Robb Smith and already has his replacement lined up, according to the Raleigh News & Observeron Saturday. The paper reports Elko is pursuing Texas A&M co-defensive coordinator/linebackers coach Tyler Santucci for the spot. Smith is leaving the staff to be closer to his family in Minnesota, according to the paper. Smith was Minnesota’s defensive coordinator from 2017-18. View the …