The Dallas Cowboys made signing defensive end Anthony Spencer to a long-term contract an offseason priority, but the likelihood it actually happens is dimming. 

Spencer and the Cowboys left the negotiating table today, and Ian Rapoport of NFL.com reports, both sides are content with entering the 2013 season with a one-year contract for Spencer.

Spencer signed the one-year, $10.6 million tender this year when the Cowboys decided to franchise tag him according to NBC Sports.

If an extension is not worked out between the two sides before July 15th, Spencer will become a free agent after the season according to ESPN.com.

The defensive end had his best season in 2012 recording 95 tackles, a career high, and reaching double digits in sacks for the first time in his career with eleven. Spencer was also second on the team in sacks.

Rotoworld reports that the two sides have maintained a positive relationship despite giving up on negotiations.  Spencer turns 30 next year which seems to be the leading reason for why the Cowboys are dragging their feet.

If a deal between the sides is not reached before the July 15th cutoff date, then contract talks cannot reopen until after the 2013 season. 

At that point, the Cowboys could again franchise tag him, for the third straight season, but the defensive end will receive a significant pay raise, 44 percent which raises Spencer's salary to over $15 million.

So for many reasons, the Dallas Cowboys have just a few more weeks to agree to a deal with Spencer, or let him walk after 2013.