During the trial of the men accused of the assassination of Ferdinand and his wife, Čabrinović was the only defendant to express regrets and apologize to the children of the victims. The children, Princess Sophie, Max and Ernst, were told about Čabrinović's apology and wrote a letter to him. In the letter, they said they had heard about his apology and stated that his conscience could be at peace because they forgave him for his role in the murder of their parents. Sophie and Max signed the letter; Ernst refused. The letter was delivered personally to Čabrinović, by the Jesuit Father Anton Puntigam, in his cell at Theresienstadt. On 23 January 1916, Sophie, Max and Ernst were informed that Čabrinović had died.