CNN's new John F. Kennedy Jr. documentary unearthed a heartbreaking final letter that Jackie Kennedy wrote to her son days before her 1994 death from cancer. Family friend Gary Ginsberg revealed in the three-episode docuseries American Prince that, while Jackie was on her deathbed, she shared encouraging words for her then 33-year-old son about his place in their family's grand political legacy. "I understand the pressure you'll forever have to endure as a Kennedy even though we brought you into this world as an innocent," Jackie wrote to John.