IRVING, Texas -- The Dallas Cowboys will not be signing linebacker Will Herring, according to sources.

Herring had agreed to a one-year deal Thursday, but both sides agreed to walk away, which keeps Herring as a free agent. Because Herring never signed the deal, the team never made an announcement. A source said it was not related to a failed physical.

UPDATE: Herring’s agent, George Mavrikes said he is angry with the Cowboys, saying they reneged on the deal.

“He passed the physical but they think he may be an injury risk,” Mavrikes said via e-mail. “He is healthier than 90% of the league. He hasn't missed a game or a practice the last two years and maybe missed five or so games in seven years, four because of a hamstring in his rookie year. They need solid players like him. Fairly priced, never an issue off the field, can play (outside linebacker), was special teams captain, plays great against the pass and most of all, doesn't get hurt, which is why they said they want out of the deal they agreed to. It's crazy and makes no sense.”

Herring was viewed as a special teams player and backup linebacker for the Cowboys. He spent the last three seasons with the New Orleans Saints, playing mostly special teams and backup linebacker, and was the special teams captain in 2013.

In his three years with the Saints he started three games and had 35 tackles, two interceptions and forced one fumble. He joined the Saints after a four-year run with the Seattle Seahawks. He had three tackles on defense and two on special teams in New Orleans' win against the Cowboys last season.