Juliet Hulme pictured in 1954.
Juliet Hulme, of Hulme-Parker murder notoriety, has spoken out about the killing, saying she and Parker were never lesbians.
Hume - who became British writer Anne Perry - and Pauline Parker murdered Pauline's mother in Christchurch in 1954 by bludgeoning her with a brick.
A film version of the story of the two 15 year olds, Heavenly Creatures, portrays the lesbian relationship between the two.
But Perry has told the London Times Saturday Magazine that although they were never lesbians the relationship was obsessive.
The schoolgirls lured Mrs Parker to Victoria Park in Christchurch, on June 22, 1954, where they hit her repeatedly on the head with half a brick in a sock.
Pauline planned the "moider" in her dairy. The girls wanted Mrs Parker killed so that Pauline would be sent to live with Juliet/Anne Perry.
The subsequent trial became one of the sensations of the time. The court was shocked with Pauline's diary. An entry for June 22 was headed: The Day of the Happy Event.
The girls were jailed separately -- they never saw each other again -- and given new identities on release.
Perry said of her part in the killing that she "made a profoundly wrong decision.
She added that she feared Pauline would take her own life "and it would be my fault."
She also says doctors tried experimental -- now known to be mood-altering -- drugs as part of her treatment for tuberculosis in a Christchurch sanatorium.
" A long needle in your behind every third morning. They'd catch you when you were still asleep."
Perry became the only child inmate in Mt Eden women's prison in Auckland.
She said she spent the first three months in solitary where she got down on her knees, cried and repented.
"I was guilty and it was the right place for me to be."
During the day we did hard labour but I collapsed after two weeks and then I started sewing uniforms.
"The woman who kept that sewing room took a fondness for me; she wrote to me until she died.
She was in Mt Eden for five and a half years.
