A Holocaust imposter?

For years, Joseph Hirt has traveled the country telling of his escape from Auschwitz as a wildly emaciated "60-pound skeleton with skin" who slipped beneath an electric fence to freedom and later to a new life in America.

The Adamstown, Pa. resident has spoken at schools and libraries, in roundtables and to newspaper reporters, time and time again.

But during a recent presentation to a group in upstate New York, a skeptic emerged from within his usual audience of admirers. 

Now, that skeptic says his research shows that much of the 90-year-old's harrowing story is a lie.