The pensioner – likened to the fictional cannibal Hannibal Lecter – was arrested this week over the murder of her friend Valentina Ulanova, 79.
She was spotted on CCTV footage carrying Ulanova’s body parts in a black plastic bag.
Police then found Ulanova’s decapitated corpse in a nearby pond.
They believe she drugged her victim and cut her up while she was still alive after a row over dirty tea cups.
But officers who raided her flat in St Petersburg, Russia, discovered diaries kept by the ripper gran. In them she listed what police say could total 14 murders.
“I killed my tenant Volodya, cut him to pieces in the bathroom with a knife, put the pieces of his body in plastic bags and threw them away”
They include a a man whose business card was found at her home and whose remains were found 12 years ago. His head, legs and arms were cut off.
Police also suspect the former hotel worker killed her husband, who went missing in 2005.
In one diary, Samsonova confessed she butchered a lodger in her flat.
She wrote: “I killed my tenant Volodya, cut him to pieces in the bathroom with a knife, put the pieces of his body in plastic bags and threw them away.”
She told the judge: “I was getting ready for this court action for dozens of years.
“It was all done deliberately. With this last murder I closed the chapter.”
Judge Roman Chebotaryov said: “I am asked to arrest you. What do you think?”
The gran, who was put into custody, replied: “You decide, your honour. I am guilty and I deserve a punishment.”
Although technically suspended, capital punishment is still allowed.
The only legal method of execution permitted is by shooting.
The last execution in Russia took place in 1996.