One of Sydney's most notorious serial killers is believed to have hanged himself in his maximum security prison cell today.
John Wayne Glover, 72 - known as the Granny Killer - was found in his Lithgow jail cell and pronounced dead at 1.25pm (AEST), a NSW Corrective Services spokesman said.
He had been serving life without parole for the murder of six elderly women on Sydney's north shore between 1989 and 1990.
In May he collapsed in his cell and was placed on suicide watch after telling prison officers: "I've had enough - I want to kill myself."
At that time he was assessed by a mental health review team and monitored by closed circuit television, receiving a complete medical check-up, having undergone two operations in previous years for cancer.
The former Mosman pie salesman, who was born in the Midlands of England in 1932, was caught after being found close to death in the bath of his sixth victim, Joan Violet Sinclair, 60, a friend of Glover's.
His oldest victim was 93, although police believe he was responsible for four other murders.
Sentencing him to a true life sentence in 1991, Justice James Wood said: This is a case where the prisoner will never be released."
Corrective Services say a report will now be prepared for the coroner.
"We are confirming that he was found dead in his cell believed to have hung himself," the spokesman said.
During the trial, a detective told the court that after his arrest, Glover admitted: ``I can't help myself.''
Years after his conviction, in an interview with Lindsay Simpson and Sandra Harvey for their book, The Killer Next Door, Glover said: ``It never occurred to me to worry about who they were, or why I killed them ... if I saw their photos in the paper they meant nothing to me.''
``I wanted to stop killing, but couldn't, no matter what,'' Glover said.
``As the killing was over, I returned to a normal life and I didn't think about them,'' he said.
Other serial killers who have got true life sentences:
* Ivan Milat serving life for killing seven backpackers between 1989-92..
* James Miller serving life for killing six young women abducted, raped, strangled and buried in bushland near Truro, SA in 1976-77.