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Leslie Van Houten, 72, is serving a life sentence for helping Manson and other followers kill Leno LaBianca, a grocer in Los Angeles, and his wife, Rosemary.
Linda Kasabian, who played a key role in sending her fellow Manson Family members to prison, has reportedly died at the age of 73.
Linda Kasabian, who dodged jail by testifying against the other members of the cult, was the getaway driver and lookout during the murders in 1969 - in which pregnant Sharon Tate was butchered.
Chicago psychologist Alan Friedman is among experts who reviewed a 1997 prison exam and are challenging the belief that Manson was schizophrenic. Manson was convicted of orchestrating the 1969 killings of actress Sharon Tate and six others in Los Angeles.
Charles Manson follower Patricia Krenwinkel, now 74, was convicted in the slayings of pregnant actor Sharon Tate and four other people in 1969 and used the victim's blood to scrawl 'Helter Skelter' on the wall.