nypost.com — Last Updated: 2:12 AM, February 23, 2012 Posted: 1:03 AM, February 23, 2012 CINCINNATI - Actor Daniel von Bargen, who played George Costanza's boss Mr. Kruger on "Seinfeld," is fighting for his life after surviving a self-inflicted gunshot to the head, according to a report. "I've shot myself in the head .