Two or three F-117s were lost in the Persian Gulf war.
One, that I know of, was lost in a airshow, when the plane just came apart in the air. Also, before the F-117 was even revealed to the public, it was flying out of Groom Lake for awhile. Some were lost in flying accidents there. I can't tell you how many pilots lived or died in these accidents. Hope this helps. Regards.
"Beer is living proof that God loves us and wants us to be happy." --Ben Franklin