J.J. Watt, the Arizona Cardinals defensive end who has been one of the most dominant players at his position for much of the past decade, winning three N.F.L. Defensive Player of the Year
Awards and almost certainly securing a future spot in the Pro Football Hall of Fame, indicated on Tuesday that this season would be his last in the league.
Watt posted pictures on Twitter that showed him; his wife, Kealia; and their infant son, Koa, on the field at the Cardinals’ stadium and wrote: “Koa’s first ever NFL game. My last ever NFL home game.