Tags: Criminal.
Serhiy Fedorovich Tkach (Ukrainian: Сергій Федорович Ткач Russian: Серге́й Фёдорович Ткач; born 15 September 1952) is a former Ukrainian police criminal investigator originally from Russia and a convicted serial killer who claimed to have killed 100 people. He suffocated girls aged between eight and 18 and performed sexual acts on their bodies after they were dead.