Anatoly Onoprienko’s methods, like most serial killers, were unimaginable and barbaric. Onoprienko’s selection of victims had no real formula to it but was rather contingent upon homes he decided to rob and the occupants who happened to be inside at the time of entry. It was his custom to use a shotgun or other firearm and he would take the lives of entire families using such weapons, more often than not in the middle of the night. He was also convicted of numerous counts of rape (via Crime and Investigation). 

The impulse behind crimes like these, experts agree, is embedded in the minds of such people in the form of a psychological flaw. However, the criminals themselves don’t always see it that way. “I am being groomed to serve Satan,” Onoprienko stated. “I have been taken over by a higher force, something telepathic or cosmic, which drove me” (per “Mass Killers“). He died in prison of heart failure on August 27, 2013 (via IMDb).

Source: