FOXBORO (CBS) – The New England Patriots have officially locked up their 2015 draft class.

The team announced that defensive lineman Malcom Brown, drafted with the 32nd pick in the first round, signed his rookie contract.

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The former Texas Longhorn was the final Patriots draft pick to sign.

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A source told Ian Rapoport of the NFL Network that Brown signed a four-year deal.

Brown’s signing was accompanied by the announcement that the Patriots released tight end Fred Davis.

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Davis, a former member of the Washington Redskins, signed with New England in the offseason.