Photos have emerged of smirking assassin Alexey Sherstobitov, 51, and Marina Sosnenko, 31, who claims she “got interested” in the mass murderer after reading one of his fantastical novels.
She has now married Sherstobitov, who is currently 10 years into a 23-year jail term for dozens of murders.
Sosensko said: "I felt through pages of his book how many worries, sufferings and troubles he went through.
"I felt that I really wanted to support him and share his troubles.
"I wrote him via the internet at the end of October 2015.
"Our relations developed fast."
Sosensko, who is Sherstobitov's third wife, is thought to have worked as a model for Vivienne Westwood’s fashion house.
But she has claimed on social media she's a psychiatrist and received medical education during service in the Russian Navy.
The Kirov Military Medical Academy - where she was supposed to have been trained - denied knowledge about her.
And a photo of her wearing medical uniform and holding a gun has links to a major St Petersburg psychiatric clinic, but staff there also denied any knowledge of her.
Sosensko's mum Natalia insisted she is happy her daughter has wed a former gangster.
She said: "I wasn’t scared and I am not scared now.
“I think it’s completely fine that they decided to get married.
“Marina came to visit me soon after the wedding and shared her positive impressions.”
Sherstobitov was once dubbed Russia's "most notorious hitman" by the country's press for his killing spree.
He once earned the equivalent of £40,000 (3.4 million Russian Rubles) each month as a contract killer.
He targeted wealthy businessmen, including nightclub owner Losif Glotser and entrepreneur Otari Kvantrishvili.
But Sherstobitov, nicknamed Lesha the Soldier, was finally found guilty of murdering a dozen people in 2008.
Now he claims he is a reformed man, and has penned several novels during his time inside.