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Serhiy Tkach: The Killer Cop Known as the 'Pology Maniac'

Jun 6
3 min read

Updated: Jun 18

Serhiy Tkach spent his career learning how the police catch killers — and then used that knowledge to become one of the most elusive murderers of the post-Soviet era. A former criminal investigator, he murdered at least thirty-seven women and girls over more than two decades in Ukraine, all while understanding exactly how to keep investigators chasing the wrong men. And chase the wrong men they did: before Tkach was caught, innocent people were jailed for his crimes, and at least one died behind bars for a murder he never committed.

It is that detail — a man who had once worn the badge weaponising the system against it — that makes the Tkach case so disturbing, and so instructive about the danger of confident, flawed investigations.

From investigator to predator

Tkach was born in 1952 in Kiselyovsk, in the Kemerovo region of Soviet Russia. After military service he trained and worked as a police criminal investigator, by some accounts a capable one. In the early 1980s he relocated to Soviet Ukraine and continued in law enforcement in the Dnipropetrovsk region — the very area that would become his hunting ground. He understood crime scenes, forensics, and the assumptions detectives make, and he turned all of it to murderous use.

Decades of murder

From around 1980, and intensively through the following decades until 2005, Tkach preyed on girls and young women, many between roughly eight and eighteen years old. He raped and strangled or suffocated his victims, and his crimes spread across several Ukrainian regions. Because the victims were often vulnerable and the killings spaced out over a long span, the connections between them were slow to emerge, and the true scope of what he was doing remained hidden for years.

A killer who knew how police worked

Tkach's background gave him a terrible advantage that ordinary offenders lacked. Investigators later described how he used his understanding of forensic procedure to avoid leaving usable evidence, and how he reportedly chose locations near freshly tarred railway lines to throw tracker dogs off his scent. His grasp of how cases were built — and how they fell apart — allowed him to operate for an extraordinarily long time while the investigations around him stalled and misfired.

Dark poster of Serhiy Tkach behind prison bars, with bold text calling him Ukraine’s most notorious serial killer and 100+ victims.

Innocent men imprisoned

One of the darkest aspects of the case is that, before Tkach was caught, a number of innocent men — reportedly as many as nine or ten — were wrongly jailed for murders he had committed. At least one of them died by suicide while imprisoned for a crime he did not do. Those wrongful convictions are a devastating indictment not only of the investigations but of the very system Tkach had once served, and they multiplied the human cost of his crimes far beyond his direct victims.

Capture

Tkach's downfall came in August 2005, when he attended the funeral of one of his victims. Children who had been present recognised him as the man last seen with the girl before her death, and he was arrested at his home in Polohy. He confessed, claiming to have killed more than a hundred people over the years, and, defiant to the last, he demanded the death penalty — a punishment Ukraine had by then abolished.

Trial and death behind bars

After a lengthy trial concluding in 2008, Tkach was convicted of the murders of thirty-seven women and girls, along with multiple attempted murders, and sentenced to life imprisonment. His stated motives shifted over time, from revenge against women to mocking his former police colleagues to simple gratification, and investigators ultimately concluded the killings were driven by his own pleasure. He drew further unsettling attention when a woman fascinated by his case reportedly married him in prison. He died of heart failure in 2018, at the age of sixty-six, without genuine remorse.

The Tkach case endures as a study in how institutional knowledge and trust can be turned into weapons, and how confident but flawed investigations can destroy the innocent. The women and girls he murdered, and the men wrongly imprisoned for his crimes, are the reason it is still studied — a double tragedy written into the record of a single killer.