A SPORTS star allegedly stabbed her lover's teen stepson to death in an "occult" murder after trying to cut a pentagram into his back.

       Maria Korneeva, 29, a three-time archery-biathlon champion, has been detained over the death of her lover’s 15-year-old stepson, Roman Fedulov.

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       Maria Korneeva, 29, has been detained over the boy's death Credit: East2West 4

       Roman Fedulov's body was found hidden in an abandoned well in a forest Credit: East2West

       Her boyfriend Vladislav Tsykunov, 52, has also been arrested.

       He claimed Korneeva intended to frighten the teenage boy with a wrench and use a knife to cut a ritualistic symbol on his back - but she killed him instead.

       Fedulov's body was found hidden in an abandoned well in a forest near the village of Zemenki in Russia on Wednesday.

       On October 8, Tsykunov was arrested on suspicion of kidnapping his stepson, according to reports citing law enforcement.

       He had divorced Fedulov's mother before he started dating Korneeva.

       Tsykunov reportedly became interested in the occult - supernatural beliefs and practices - and wanted to use it to get back with his ex-wife Elena Fedulova.

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       Tsykunov - who ran a business selling amulets online - said they had aimed to cut a pentagram five-pointed star on the teen boy’s back.

       In video testimony to the Russian Investigative Committee, he said: "Maria took a wrench, wrapped it in fabric and a hunting knife.

       "She took the knife to draw (a pentagram)... I told her to watch out and not to kill him. She said she’d only stun him."

       Tsykunov claimed he was waiting in a car at the time of the killing.

       He said: "She ran back with her eyes wide open saying 'I killed him'.

       "I said ‘OK'. I’m in shock."

       He said he went to investigate and found the boy dead with two stab wounds.

       Blood stains were later found on his sneakers, according to sources.

       Police reportedly believe Tsykunov manipulated the CCTV footage taken at his former marital home in order to hide the circumstances surrounding the murder.

       His collection of black magic images was also found, according to reports.

       When the boy went missing, his former stepfather volunteered to help with the search.

       A message on Korneeva’s now-deleted social media said: "Those who have seen darkness once will never believe in the light."

       A source at Korneeva's former sports club said Maria "set a goal and walked towards it in a cold blooded way", adding: "She worked, worked and worked."

       She had recently stopped training and divorced her husband - a cook - and devoted herself to her new lover.

       Both Korneeva and Tsykunov remain in custody after being arrested over the death of Fedulov.

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       Maria Korneeva had recently divorced her husband - a cook - and devoted herself to her new lover Credit: East2West 4

       Korneeva's boyfriend Vladislav Tsykunov, 52, has also been arrested Credit: East2West