Irina Kozlova, 34, drove Evgeny Markov - who she had recently started dating following her divorce - to a spectacular viewpoint at a scenic village in her Mini Cooper.
After asking her to close her eyes, he got out a knife and carried out the attack.
Her body was found in her car in Ust-Mana village overlooking the Yenisei River, near the Siberian city of Krasnoyarsk.
Markov, 34, was detained soon afterwards while calmly having dinner in a restaurant.
State investigators said that Markov immediately confessed to the murder.
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He was upset that she had found out the truth about his lie to her that he was a successful businessman. She discovered instead that he was working as a car washer.
He told police that she 'laughed at me' over his fiction.
The Russian Investigative Committee - which probes serious crimes - said: "On the eve of the murder the man informed his new acquaintance that he wanted to surprise her and invited her to choose a romantic place."
She drove him to the village 'where the man said he asked her to close her eyes, then with a pre-prepared knife inflicted multiple wounds which were fatal.'
She was known locally as a popular skier and snowboarder.
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