The widow of Dale Mooney, the 53-year-old father of two from New Hampshire who died Sunday after being punched while attending the Patriots-Dolphins game at Gillette Stadium in Foxborough, Mass., is demanding answers.

Mooney died after what has been described as a physical confrontation with a Dolphins fan in the fourth quarter of the “Sunday Night Football” game.

Lisa Mooney, who noted her husband had been a Patriots season ticket holder for 30 years, talked with WCVB in Boston and said she was “numb.”

“I just feel numb,” she said. “I just can’t even believe this is for real.”

Lisa Mooney also told the station, “I want to know what happened. What caused this?”

Joey Kilmartin from Nashua, N.H., said he witnessed the altercation.

“The Dolphins fan walks over and clearly punches him in the face,” Kilmartin told MassLive. “(He) gets knocked out and you can tell right away he’s not OK.”

Kilmartin told police Mooney didn’t regain consciousness after going down and that EMTs performed CPR before taking him to nearby Sturdy Memorial Hospital in Attleboro.

Mooney was pronounced dead shortly before midnight.

Kilmartin gave WCVB video of the encounter, which shows Mooney approaching other fans on the 300 level of the stadium.

“He basically grabbed another fan,” Kilmartin told WCVB. “They started tussling around for a few minutes. At one point, another fan walked over. He punched him … and the man just went out. It was pretty hard to watch.”

Lisa Mooney is left with more questions than answers.

“I just don’t understand why people have to go to that extreme. Why can’t it just be fun? That’s all it’s supposed to be, a fun family event,” Mooney told WCVB. “It takes a lot to get him mad. He has the patience of a saint. I don’t know what happened.”

The Massachusetts State Police and Norfolk District Attorney’s Office are leading the investigation.

No charges have been filed and an autopsy will happen in the coming days, according to WCVB.