The Facts: Witten has signed a four-year extension through 2021, according to league sources.

Diehards Line: This is the fourth contract Witten, who turns 35 in May, has signed with the Cowboys since being picked in the third round in 2003. He is the franchise leader in receptions and will become its leader in yards and most games played this season. As NFL Network's Ian Rapoport notes, the new deal is a cap-related move to lower Witten's number for 2017 (that doesn't change much else).