The Dallas Cowboys are re-signing free agent receiver Brice Butler to a one-year deal, according to a source.Butler was the Cowboys' No. 4 receiver last season but could be in line for a bigger role in 2017 because Dallas could lose No. 2 receiver Terrance Williams, also an unrestricted free agent, to another team.Butler, 27, joined the Cowboys in 2015 after starting his career in Oakland.