This date 1996
Seven pitches into the Opening Day game between Montreal Expos and the Cincinnati Reds at Riverfront Stadium, MLB umpiring veteran John McSherry collapsed and died of a massive heart attack.
The game was postponed.
Here is Tim Sullivan's column for the Cincinnati Enquirer the next day.
"I watched a man die today," Reds pitcher Pete Schourek said, "and it hits home in a hurry."
More from the NY Times:
He never regained consciousness and was pronounced dead at University Hospital in Cincinnati about an hour after the start of the game between the Reds and the Montreal Expos. The hospital said McSherry, 51 years old, suffered sudden cardiac death.