seeking information about 1976 murder of COG member in Belgium

An August 1977 Time Magazine article about the COG has this puzzling information in a footnote:

"The Children blame unspecified "enemies" for the death of at least one disciple, whose nude body, with several internal organs crushed, was found last year at a medieval fortress in Belgium. Opponents suspect the sect itself, and police have never solved the case."

Does anyone know anything about this or remember hearing about it at the time? Any information at all would be helpful.

• Time Magazine: Tracking the Children of God