Eddie Montague
"Right Field Umpire - Game 6 1986 World Series"

I sent a request to Eddie Montague asking him to tell the story on a baseball about his involvement as the best person on the field to witness Mookie Wilson's ball hit to Bill Buckner in the 1986 World Series and this is what I received:

"1986 was my first World Series filled with lots of drama and excitement. With the Red Sox winning 5-3 in the bottom of the 10th and 2 outs it was all but over for the Mets. After 3 straight hits and the Mets making it a 5-4 game, the crowd came alive with a deafning sound. With Mookie at bat, the crowd began to chant 'Mookie'. After a wild pitch to bring home Knight the score was tied."
"Umpires hate ties. I stood in right behind John Kibler the first base umpire with thoughts of more extra innings. Mookie then hit a grounder to first and I thought inning over on to the 11th. I was now in shock as the ball scooted through Buckners legs. As second baseman Marty Barrett came over to pickup the ball, I said, I got it Marty and put the ball in my pocket."
"After the Mets won the Series in game 7, I gave the ball to my good friend Arthur Richmond who worked for the Mets. Arthur later auctioned the ball for charity. The ball sold for $93,000"
"If it wasn't for Bill Buckner, I don't believe the Red Sox would have been in the World Series in 1986. He was a great player and I hope remembered for what he gave to the game."

If you are not familiar with the event, here is the detail from MLB.com.