for the guardians, that meant the end of the gravy train. it's a powerful motive, and in sybil's case, it was almost like clockwork. at the age of 21, sybil was found dead. for more than a half jury, sybil's family and descendants thought she had died of kidney disease. >> the story was that she died of some natural causes, and no one talked about it. that, it turned out, was not the case. >> years later, connor's cousin, dennis mcauliffe, began to investigate his grandmother's death and discovered a discrepancy between the family lore and the official records. and so what was discovered about her actual death? >> the facial death notice in the funeral home was a self-inflicted gunshot. that surprised everyone. no one knew that.