According to Russian officials, Oleg Sviridov, 32, saved mobile phone footage of his assault of many youngsters in Vintai village, Samara area.

Vyacheslav M, a rocket engine manufacturing worker, was drinking with his buddy Sviridov when he watched a film on the man’s phone of his daughter, who is now nine, being raped.

Other horrifying films apparently revealed prior savage rapes of village girls as young as six and eleven years old. According to the photographs, the deceased suspect had been molesting youngsters for five years.

Oleg Sviridov, a child sex abuser, was forced to dig his own grave in a woodland in the country’s Samara area by his father. After a quarrel with his father, Vyacheslav (Slava) Matrosov, 35, Sviridov died of knife wounds and was surreptitiously buried in an unmarked grave.

Investigators believe Sviridov committed suicide during the woodland brawl in which Matrosov expressed his outrage about the sex abuse.

Matrosov was first detained on suspicion of murder, which sparked outrage in Russia. Krasnoglinsky Court in Samara found him guilty last week of ‘inciting’ his companion to commit suicide.

The father saw a horrible and explicit film on his friend’s phone showing Sviridov forcing his daughter to perform a sex act on him, and the friendship fell apart. When Sviridov’s phone captured explicit sex abuse footage of the youngster, she was just six years old.

The nine-year-old child was heard screaming and pleading with Oleg to leave her and let her go home as she was in pain. If Matrosov, a former rocket engine factory worker, had been charged with murder, he might have faced a 15-year sentence.