Security camera footage shows 68-year-old Tamara Samsonova on an allegedly sinister mission at her home in the Russian city of St Petersburg.
She is accused of killing a paralysed pensioner she was caring for, and scattering the dismembered body in bags in a nearby residential area.
She's also suspected of killing a 32-year-old lodger in 2003 and getting rid of his remains in the same way. But investigators believe that may not be the end of the story.
Dubbed the 'Granny Ripper', Samsonova wrote a diary confession to at least 10 murders, hacking apart her victims in a reign of terror that may have lasted two decades, reports the Daily Mail.
Samsonova being questioned by police
The former hotel worker entered details of her macabre secret life in diaries which she kept in Russian, English and German, alongside black magic and astrological books.
She was detained this week after CCTV footage showed her carrying body parts of an elderly woman in a black plastic bag.
Police are now comparing her elaborate diary entries with known cases of unsolved murder cases where victims were dismembered, and body parts packed in bags strewn around the city.
Samsonova was detained after the headless body of 79-year-old Valentina Ulanova - for whom she was a carer - was found near a pond on Dimitrova Street in St Petersburg.
A headless, armless and legless man's body was found on the same street 12 years ago, and evidence found in her flat, including a business card for the victim, links her to the crime.
Samsonova is now being questioned by police. She admits committing the crimes but without going into detail, say reports.