At 6pm on 16 August 1617, Brian was found dead in his bedroom in
Brussels. His death was under suspicious circumstances, as he had been hanged with his hands tied behind his back. His tutor, Fr. Nicholas Aylmer, was absent as he had gone to procure lodgings for him near the summer residence of the archdukes. Ensign Cormack (brother to
Owen Roe O'Neill) attended the youngsters and was investigated, but no foul play was determined. According to historians Casway and Dunlop, at the time, his cause of death was not conclusively proven. However, Fr. Donagh Mooney wrote that "the inquest was held, and it was shown beyond doubt that the boy was foully murdered".
Paul Walsh calls Brian's death an "assassinat[ion]".
John O'Hart says Brian was "strangled in his bedroom in Brussels... by an English assassin". Conversely, Jerrold Casway states that Brian died "as the result of an accident during a children's game". Brian was thirteen years old at the time of his death, predeceasing his mother Catherine. His death caused great despair and isolation in his mother, who had lost her husband only the previous year. Brian's body was brought to Leuven and buried at St Anthony's College. Fr. Mooney described Brian as "a fair child, in sooth,... devout, fond of books, learned men, military science, in which, had God spared him, he might one day have rivalled his illustrious father". == References ==