Viktor Sayenko, Igor Suprunyuck, and Alexander Hanzha, collectively known as "The Dnepropetrovsk Maniacs", were a pack of Ukrainian thrill killers who brutally killed dozens of people during a near-four week-long murder spree. Starting on July 25, 2007, with Ekaterina Ilchenko and Roman Tatarevich, Sayenko and Suprunyuck initiated their killing spree, randomly picking pedestrians and then bludgeoning them with blunt objects, such as hammers and steel construction bars, and recording some of the murders. Some of the victims were also robbed of their possessions. Multiple bodies would be found in one day, usually two. Additionally, some victims were killed in not Dnepropetrovsk, but towns located in the surrounding areas. Their spree came to public attention after a survivor, fourteen-year-old Vadim Lyakhov, immediately ran to the police after his friend was murdered by them, and also when a victim, Natalia Mamarchuk, was beaten to death in front of many witnesses. The initiated investigation was kept secret at first, but eventually, sketches were distributed and the victims’ stolen possessions were listed to local pawn shops.
The three were arrested a week after the spree ended, when Suprunyuck tried selling a mobile phone belonging to one of his victims. The phone had to be turned on to ensure it worked, allowing law enforcement agents to find it and trace its location, leading to the arrests of Sayenko and Suprunyuck. Meanwhile, authorities invaded Hanzha’s home and arrested him, but not before he managed to erase the information on numerous stolen mobile phones he attempted to flush down the toilet. Sayenko, Suprunyuck, and Hanzha were all charged for numerous instances of premeditated murder (excluding Hanzha), animal cruelty, robbery, and armed robbery. Sayenko and Suprunyuck’s ghastly videos of their murders received a large amount of attention. One of the videos (titled “3 guys 1 hammer”) managed to find its way into the Internet on December 4, 2008; it is a recording of the brutal murder of Sergei Yatzenko, who was killed on July 27, 2007. The leaking of the video received criticism, but it was later admitted that control over videos posted on the Internet was “virtually impossible”.