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The Lions signed Rex as an undrafted free agent Friday, Tim Twentyman of the team's official site reports.
Rex has his work cut out for him to compete for a depth role in Detroit's tight end corps, which has Brock Wright, James Mitchell (hand) and Shane Zylstra available behind young phenom Sam LaPorta. Rex racked up 34 catches for 422 yards and three scores last season at BYU.
