I was also interested to read that the last player who retired in this fashion from the Phillies was Center Fielder Doug Glanville. My family and I watched Glanville play single-A ball in the Cubs farm system one summer in upstate NY, then when he came over to the Phillies it was a pleasure to watch him hold down the fort in Center Field.
Just a little Phillies fan moment here on Math Day!
More details on Lieberthal's final day in the bigs.