article_content: 
  dallas tight end jason witten has signed a four-year contract extension that virtually guarantees the 14-year veteran will spend his entire career with the cowboys. the deal witten signed on tuesday runs through to 2021 and leaves the final year of the two-time all pro's current contract intact. the extension has a maximum value of $29m with no new guaranteed money and gives the cowboys the flexibility to restructure and create about $4m in salary cap space. witten  who turns 35 in may  is one of two tight ends in nfl history with at least 1 000 catches and 10 000 yards receiving. the other is tony gonzalez  who retired in 2013 after 17 seasons.
article_headline: jason witten signs new four-year deal with dallas cowboys