Police and fire personnel responded after Dale Mooney, 53, appeared to suffer a medical event just before 11pm in the 300’s tier of the Patriots home ground in Foxborough, Massachusetts.
He was rushed to Sturdy Memorial Hospital in Attleboro where he was pronounced dead by doctors.
In a statement, the Norfolk District Attorney’s Office said Mooney’s death was under investigation by Massachusetts State Police assigned to the office as is standard protocol.
An autopsy is yet to be scheduled and no charges have been laid, the district attorney’s spokesperson said.
Mooney’s grieving wife told Boston 25 that he was a lifelong Patriots fan who was a loving father to the couple’s two adult sons.
In a separate incident, two off-duty firefighters were credited with saving the life of a Patriots fan who suffered a cardiac arrest during Sunday’s game.
“My parents are at the Patriots game with their friends and someone in their section just had a heart attack and my dad’s friend (also a firefighter) started giving him CPR and saved his life,” NFL reporter Bridget Condon wrote in a post on X.
“Forget the football. This is the best thing I’ve heard all day,” she added.
Ms Condon posted a photo to X, formerly known as Twitter, where she described Anthony Colella of Johnston, Rhode Island Fire Department and Mark McCullough of Needham Fire Department as the “heroes” who gave CPR to the fan.
The Dolphins won Sunday’s game 24 to 17 to condemn the Bill Belichick-coached team to its second defeat of the season.