Forty-nine year old Washington National's ballpark vendor saved the life of a young fan during an August game at Nationals Park.

The story was first reported by Dan Stenberg of the Washington Post, here.
The story is also reported on YahooSports.com, here.

Marlow saw the young fan in trouble, dropped his gear and went to help.
Marlow administered the Heimlich Maneuver until a piece of chicken was freed from child's throat.