 Today marks 25 years since John F. Kennedy Jr. was killed, along with his wife and her sister, when the single-engine plane crashed into the Atlantic Ocean. John F. Kennedy Jr. was born two weeks after his father was elected president. He grew up as the heir to the Kennedy's Camelot. That story ended 25 years ago today, when the single-engine plane he was piloting did not arrive as scheduled at Martha's Vineyard.