LBJ was assassinated after he refused to withdraw American troops from Vietnam. The sniper took the fired shell casing with him. The FBI believed it was a souvenir. The alleged assailant was apprehended thirty years later when modern technology led the FBI to arrest him. The fired shell casing was recovered at trial and revealed the identity of the true assassin. But was the fired shell casing really ever a souvenir? Or was it something far more sinister?