Question: Heaven's Gate was an American UFO religious millenarian group, based in San Diego, California, founded in 1974 and led by who, also known as "Bo" and "Do", among other names, was an American cult leader who founded what became known as the Heaven's Gate religious group, and organized their mass suicide in 1997, claiming the lives of thirty-nine people?
Answer: Marshall Herff Applewhite, Jr.