Adam Schefter of ESPN reports the Dallas Cowboys have signed tight end Jason Witten to a five-year, $37 million extension that includes $19 million guaranteed, according to a source. Witten had two years left on his current deal and he's now under contract with the Cowboys through the 2017 season. Witten posted news that he had agreed to an extension on this Twitter page Sunday. "I am blessed to say that I will retire a cowboy!Thx to the jones family, and all the cowboy staff! True honor to put on the star!! #gameday," he wrote. Source: theredzone.org