A true hero emerges from this tragic story

One professor, a Holocaust survivor blocked the door opening in front of the shooter with his body while his students had the chance to escape out the window.

Professor Liviu Librescu, 76, threw himself in front of the shooter, who had attempted to enter his classroom. The Israeli mechanics and engineering lecturer was shot to death, "but all the students lived - because of him," Virginia Tech student Asael Arad - also an Israeli - told Army Radio.

Several of Librescu's other students sent e-mails to his wife, Marlena, telling of how he blocked the gunman's way and saved their lives, said the son, Joe.

"My father blocked the doorway with his body and asked the students to flee," Joe Librescu said in a telephone interview from his home outside of Tel Aviv. "Students started opening windows and jumping out."

Yesterday was Holocaust Remembrance Day.