An autopsy on New England Patriots fan Dale Mooney, who died at a Sunday night game at Gillette Stadium, didn’t indicate a traumatic injury was to blame, though a “medical issue” was identified in his 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 during the Sunday night game at Gillette Stadium,” the Norfolk District Attorney’s office said in a statement. “Preliminary autopsy results did not suggest traumatic injury, but did identify a medical issue.”

Witnesses said the 53-year-old victim was punched during a scuffle at the end of the home team’s showdown with the Miami Dolphins. Mooney’s sudden collapse was “pretty hard to watch,” one spectator told WCVB.

“Cause and manner of death remain undetermined pending further testing,” according to the district attorney’s office.

No arrests have been made in the ongoing investigation, and police have not confirmed his death was caused by a punch. Authorities are asking fans who may have recorded the fight that involved Mooney to share their video footage.

He was pronounced dead shortly before midnight at Sturdy Memorial Hospital. Mooney’s wife told WCVB she wasn’t aware of any medical condition her husband might have had.

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