Witness said man was punched before he died at a New England Patriots game

Dale Mooney , 53 , of Newmarket , New Hampshire , died at Gillette Stadium last weekend .

Witness says he saw him confront a Miami Dolphins fan who he had been arguing with during game.

Witness: "It looked like somebody was in the middle of them, and then a man in the Dolphins jersey reached over and he connected with two punches".