The fortress in Dallas isn’t open for demolition anytime soon.

Star defensive lineman Quinnen Williams has agreed to a three-year, $105.9 million extension with the Cowboys, NFL Network reported Monday. The deal for Williams reportedly includes $101 million guaranteed with $63.35 million due at signing.

Williams, 28, is heading into his eighth NFL season and his second with the Cowboys after being traded to Dallas at last year’s trade deadline. He now joins a long list of defensive linemen signing big extensions this summer.

Philadelphia Eagles defensive tackle Jalen Carter reset the market in July, signing a long-term extension worth $38…

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