Man Dies at Dolphins vs. Patriots Game After 'Medical Issue' at Gillette Stadium

One fan died due to a medical issue during Sunday's game between the New England Patriots and Miami Dolphins at Gillette Stadium.

Massachusetts State Police said the incident occurred around 11 p.m., and the fan, Dale Mooney, 53, was pronounced dead after being transported to a nearby hospital.

In a statement released Wednesday, Norfolk County District Attorney Michael Morrissey said a preliminary autopsy identified a "medical issue" as the cause of Mooney's death.

"Our investigation has included numerous law enforcement interviews and the examination of multiple angles of video capturing the scuffle prior to Mr. Dale Mooney's collapse," Morrissey said. "Preliminary autopsy results did not suggest traumatic injury, but did identify a medical issue. Cause and manner of death remain undetermined pending further testing."

Witnesses told Munashe Kwangwari of NBC 10 in Boston that Mooney had been attacked prior to the incident.

"It was really one punch that I saw and the victim got punched really hard on the side of the head, and went down. He's a bigger guy but he just crumbled," one witness said, per Kwangwari.

Mooney's wife Lisa told Anthony Vega of ABC 6 that her husband had been taunted by other fans and was ultimately punched in the head three times during the altercation.

No charges have been issued.