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Koos Hertogs

Koos Hertogs

Dutch serial killer

2 min read

Why this is trending

Interest in “Koos Hertogs” spiked on Wikipedia on 2026-02-28.

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2026-01-30Peak: 202026-02-28
30-day total: 347

Key Takeaways

  • Jacobus Dirk (Koos) Hertogs (The Hague, 16 December 1949 – 's-Hertogenbosch, 19 July 2015) was a convicted Dutch serial killer.
  • Victims Tialda Visser , 12 years old, was reported missing on 11 May 1979, after she didn't return home after ballet classes at the Royal Conservatory of The Hague.
  • The cause of death could not be determined.
  • She left her home in Schiedam to go to the Academie voor Lichamelijke Opvoeding in The Hague, however she never got there.
  • She was shot in the stomach and head.

Jacobus Dirk (Koos) Hertogs (The Hague, 16 December 1949 – 's-Hertogenbosch, 19 July 2015) was a convicted Dutch serial killer. He was convicted of a total of three murders.

Victims

  • Tialda Visser, 12 years old, was reported missing on 11 May 1979, after she didn't return home after ballet classes at the Royal Conservatory of The Hague. Four days later, on 15 May, her lifeless body was found near the Leeghwaterbrug in The Hague. The cause of death could not be determined.
  • Emy den Boer, 18 years old, disappeared on 3 April 1980. She left her home in Schiedam to go to the Academie voor Lichamelijke Opvoeding in The Hague, however she never got there. Two days later, on 5 April, her body was found by a hiker in the forest near Nistelrode. She was shot in the stomach and head.
  • Edith Post, 11 years old, disappeared while at school on 29 September 1980. She left her class to get some materials from a closet in the hallway but didn't return. On 2 October her body was found in the dunes of Wassenaar. She was beaten to death, probably with a branch that was found next to her body.

Private life

Hertogs was in a homosexual relationship with Cornelis Stolk, Vice President of the court in The Hague.

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