Afton Elaine Burton, the bride-to-be, said she loves the man convicted of the notorious murders of seven people, including pregnant actress Sharon Tate.
No date has been set but a wedding co-ordinator has been assigned by the prison to handle the nuptials.
The couple has until early February to get married before they would have to reapply.
The Kings County marriage licence was issued on November 7 for the 80-year-old Manson and Burton, who lives in Corcoran — the site of the prison — and maintains websites advocating his innocence.
Burton, who goes by the name “Star”, said she and Manson will be married next month. “Y’all can know that it’s true,” she said. “It’s going to happen.”
“I love him,” she added. “I’m with him. There’s all kinds of things.”
As a life prisoner with no parole date, Manson is not entitled to family visits, a euphemism for conjugal visits.
Asked why she would marry him under those conditions, Burton said she is interested in working on his case and marrying him would allow her to get information not available to non-relatives.
“There’s certain things next-of-kin can do,” she said, without elaborating.
Manson and two followers, Leslie Van Houten and Patricia Krenwinkel, remain imprisoned. Another follower, Susan Atkins, died of cancer behind bars.
Other members of the Manson “family” still behind bars are: Charles ‘Tex’ Watson, Bruce Davis, and Robert Beausoleil.
Manson, Watson, and the women were convicted in the gruesome killings of Tate, the wife of director Roman Polanski, and four others at her estate on August 9 1969, and grocers Leno and Rosemary LaBianca who were killed the following night.
Manson is not eligible for parole until 2027.