What if the biggest mystery surrounding Col. Moammar Gadhafi had nothing to do with his long, brutal reign as the world's most eccentric and violent leader turned pariah?

And what if a long-lost letter from a Catholic cardinal who knew Gadhafi's true identity was evidence that could have solved the mystery?

To many Libyan people, the biggest question mark about Gadhafi does not involve his repressive and dictatorial rule, delusional statements or brazen lies. Behind closed doors, for years, they've wondered if he is Jewish. Last week the issue came out in the open, as NBC's Richard Engel reported from Libya that one in five rebels was fighting Gadhafi because he believes the leader is Jewish.