Woman Discovers Her Grandpa May Have Been Serial Killer

For much of her life, SierraBarter had suspicions that her family history held a monstrous secret. Her mission to find answers about who her step-grandfather was is the topic of the new documentary series, "The Truth About Jim.” While Barter tries to uncover who her step-grandfather was, clues lead her to believe he may have been the notorious Zodiac Killer. Director Skye Borgman says that Barter's journey ultimately leads to some closure for her family.