Cowboys fullback Keith Smith has agreed to a two-year, $4.2 million deal with the Oakland Raider, NFL Network's Ian Rapoport reported Thursday afternoon.The Cowboys didn't tender Smith ahead of free agency opening on Wednesday, making him an unrestricted rather than restricted free agent. They had hoped still to re-sign the fullback but at a lower price than the tender, per reports.Instead, Smith will head to Oakland.The Cowboys signed Smith, who played both as linebacker and fullback, in May 2014 after he went undrafted out of San Jose State.