The death of a man during Sunday night’s New England Patriots game against the Miami Dolphins is being investigated by Massachusetts State Police and a county district attorney’s office, according to multiple reports.

The 53-year-old was identified as Dale Mooney by the Norfolk District Attorney’s Office, per a report from NBC News.

He was in 300-level seating inside Gillette Stadium in Foxborough, Massachusetts, when he had an “apparent medical event” before 11 p.m., state police reportedly said. Police and firefighters responded and he was pronounced dead at Sturdy Memorial Hospital, according to the report.

The Norfolk District Attorney’s Office is investigating the death as part of “normal protocol,” the prosecutor’s office told NBC News.

Charges have yet to be filed in connection to Mooney’s death. Progress of the active investigation will depend on an autopsy, which could be conducted Tuesday, the District Attorney’s Office’s statement reportedly said.