IRVING, Texas -- The Dallas Cowboys are down to one unsigned draft pick with first-round choice Zack Martin signing a four-year deal on Monday.

The Cowboys surprised some by passing on Johnny Manziel with the 16th pick of the first round to take Martin, who started 52 games at Notre Dame at tackle. In the organized team activities, Martin has lined up with the first team at right guard. He also took some backup center snaps last week.

Martin’s four-year deal is worth $8.967 million and includes a $4.842 million signing bonus. Second-round pick DeMarcus Lawrence is the last remaining pick to sign.

Martin is the third first-round pick the Cowboys have used on the offensive line in the last four years, joining Tyron Smith (2011) and Travis Frederick (2013). He was a two-time captain at Notre Dame and was named the MVP of the New Era Pinstripe Bowl. The last offensive lineman to be named an MVP in a bowl game was Penn State center Jay Huffman in the 1959 Liberty Bowl.