Charles Manson and his fiancée, Afton Elaine Burton, have allowed their marriage license to expire without getting married. 

The expiration date is February 5, but the prison only conducts weddings on weekends. The couple will have to apply for a new license if they still wish to marry. 

California Department of Corrections and Rehabilitation spokeswoman Terry Thornton confirmed that the couple has yet to wed, despite receiving the license in November. Thornton would not speculate as to why the nuptials have not taken place. 

New York photo agency editor James McGrath said he has been in contact with Burton, and she intends to apply for a new license and proceed with the wedding. 

Manson is serving a life sentence at Corcoran State Prison for ordering the 1969 murders of Jay Sebring, Voytek Frykowski, Abigail Folger, Steven Parent, Sharon Tate, who was eight-and-a-half-months pregnant at the time, and Jay and Rosemary LaBianca.

The 80-year-old has been denied parole 16 times, and must wait 12 years before being eligible for parole again.

Burton, 27, told the Associated Press that she believes her fiancé is not guilty, and plans to prove his innocence after they are married. She currently runs several websites and social media accounts purporting Manson's innocence.

The couple is allowed to greet one another with a kiss at the beginning and end of each prison visit, and Burton said she visits every Saturday and Sunday. Conjugal visits are not allowed in California for prisoners serving life sentences.