Death of a hero

I am having a bit of trouble with a trigger that is to detect the death of my hero in my map. When the hero is killed nothing happens. The hero is not supposed to be revived and the trigger to detect his death is a losing trigger. Setting it as "Unit - A unit Dies" and then specifinge the unit type as a hero in the conditions is not working. Suggestions?

It should be a boolean comparison Unit Classification like (Dying Unit) is equal to (A Hero)

use:

unit becomes reviveable
(or was it hero - becomes reviveable?)