Manson convinced the cult of the impending violence, which he dubbed Helter Skelter after the 1968 Beatles song.
First Bates's son Tristan, 19, collapsed and died at a party in 1990 after an asthma attack.
Michelle Phillips, of the Mamas and the Papas told of visiting that house and 'everyone in the house was busy filming an orgy and Sharon Tate was part of it'.