Marshall Applewhite, American cult leader, founded Heaven's Gate (died 1997)

Marshall Herff Applewhite Jr., also known as Do, among other names, was an American religious leader who founded and led the Heaven's Gate new religious movement, and organized their mass suicide in 1997. The suicide is the largest mass suicide to occur inside the U.S.

Heaven's Gate was an American new religious movement known primarily for the mass suicides committed by its members in 1997. Commonly designated as a cult, it was founded in 1974 and led by Marshall Applewhite (1931–1997) and Bonnie Nettles (1927–1985), known within the movement as Do and Ti. Nettles and Applewhite first met in 1972 and went on a journey of spiritual discovery, identifying themselves as the two witnesses of the Book of Revelation, attracting a following of several hundred people in the mid-1970s. In 1976, a core group of a few dozen members stopped recruiting and instituted a monastic lifestyle.