Five suspects in the murder of Peter R. de Vries were also involved in the serious assault of an ex-brother-in-law of Ridouan Taghi in May 2021. Taghi is said to have ordered this from the EBI in Vught.

Ridouan Taghi's ex -brother-in-law was assaulted by three men with a baseball bat on May 2, 2021. Two days later he was assaulted again. An attempted murder in September 2021 failed.

According to the criminal investigation department, the murder suspects in the De Vries case 'in close cooperation and varying composition' played an important role in 'several attempts to seriously abuse or kill Taghi's ex-brother-in-law'. These would be Kamil E., the Polish driver who drove the getaway car after the murder of De Vries, Taghi's cousin Jaouad F ., Erickson O. (who filmed De Vries after he was shot) and the convicted arms dealer Divainy K. The violence allegedly directed by murder broker Krystian M.

With the new evidence from the criminal investigation department about the abuse, the suspected perpetrators of the murder of De Vries are linked to Taghi for the first time, according to EenVandaag. That the murder of the crime journalist is related to the Taghi case has been suspected for a long time, but hard evidence has been lacking so far.