Please stop calling him Heather. It should also be mentioned in the calendar fact section that it was the last game of Heath's career. I don't think he ever played again.
How far back have they actually gone with WAR calculations? My guess will be Ernie Banks.
Not sure why I typed Heather. Not sure if this is some common thing I have missed out on.
Bill Buckner, '81 Cubs. 1.2 WAR.
Right year, wrong player. The player was a pitcher.