Anjou immediately convened the State Council, issued a summons for an early meeting of the states-general, and published a proclamation that all persons having information to give concerning the crime which had just been committed, should come instantly forward, upon pain of death.

The body of the assassin was forthwith exposed upon the public square, and was soon recognized as that of one Juan Jaureguy, a servant in the employ of Gaspar d'Anastro, a Spanish merchant of Antwerp.
The letters and bills of exchange had also, on nearer examination at the Town House, implicated Anastro in the affair.

His house was immediately searched, but the merchant had taken his departure, upon the previous Tuesday, under pretext of pressing affairs at Calais.

His cashier, Venero, and a Dominican friar, named Antony Zimmermann, both inmates of his family, were, however, arrested upon suspicion.

On the following day the watch stationed at the gate carried the foreign post-bags, as soon as they arrived, to the magistracy, when letters were found from Anastro to Venero, which made the affair quite plain.