In a new two-hour special edition of "20/20," ABC News anchor Diane Sawyer and team decode the mysteries of the cult and examine the secrets of its compelling leader, Marshall Applewhite.

Heaven’s Gate was led by Marshall Applewhite, who went by the name “Do,” and Bonnie Nettles, who went by “Ti.” ...

Marshall Applewhite, the cult’s co-founder and leader, was a music instructor at UA in the early 1960s, about 12 years before he founded Heaven’s Gate with a co-believer, Bonnie Nettles.

Marshall Applewhite's brainwashed Heaven's Gate cult members ate a drug-laced applesauce on their final 'graduation' day. The crazed man told them to commit suicide to reach true holiness.

Among the cult's following, Marshall was known as "Do." Following the discovery of the Hale-Bopp comet in July of 1995, Marshall told the Heaven's Gate members that it was a signal from aliens.

April 16 2018, Published 4:42 p.m. ET Texas music-teacher-turned-cult-leader Marshall Applewhite, became known for leading the biggest mass suicide in American history in 1985.

“We know whatever happens to us after we leave our bodies is a step forward” — videotaped message by Marshall Applewhite, leader of Heaven’s Gate. Driven by the belief that the comet Hale-Bopp was ...

It’s impossible to pinpoint when a mind first veers from eccentricity into madness, but Marshall Applewhite may have hit that fork in 1969 when Neil Armstrong took humankind’s first step on ...

Heaven’s Gate leader Marshall Applewhite’s heart disease may have hastened his death after he took a lethal mix of drugs and alcohol, according to an autopsy. Results confirm the charismatic ...