Cam Heyward is getting a massive contract extension from the Pittsburgh Steelers. According to Jeremy Fowler of ESPN, the star defensive lineman has agreed to a three-year, $45 million deal that includes $29 million in new money and $16 million fully guaranteed. Heyward is now under contract through the 2026 season. He was entering the final year of his old deal and was set to make $16 million. With the signing, Heyward can retire as a member of the Steelers, the team that drafted him in 2011. It was no secret that Heyward wanted a new contract. The former Ohio State star held out of voluntary…