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Probably another camp body, but here comes Jerrell Harris:
Harris, 6-3, 242, is a first-year player from the University of Alabama where one of his teammates was Chargers tackle D.J. Fluker, the team's top pick in the 2013 NFL Draft. Harris originally signed with Atlanta as an undrafted free agent in 2012 and spent time during the 2012 season on practice squads in Jacksonville, New England and Oakland.
Harris played on national championship teams at Alabama in 2009 and 2011, starting at strong-side linebacker for their '11 championship squad.
Seems like he wasn't even a full-time player at Alabama, and some sites have him listed as a DB/LB. My guess is this is a camp body/Special Teams guy. Maybe a friend of Fluker's?