[1] In 2000, he was sentenced to seven years in prison for manslaughter after killing his wife and hiding her body.

[2] In 1991 Klinkhamer's wife, Hannelore (née Godfrinon), went missing from their home in Hongerige Wolf.

A year later Klinkhamer went to his publisher with the manuscript for Woensdag Gehaktdag, which detailed seven ways in which he could have killed his wife.

Klinkhamer became the primary suspect in the police investigation for the disappearance of Hannelore: he was questioned several times and detained once.

In 2000 the new occupants of Klinkhamer's former home started renovation on the garden, and work crews discovered the skeletal remains of his wife in clay beneath a concrete floor in the garden shed.