 By coincidence Pérez, who he admitted to having planned to kill, passed by just as O'Collun's head was being put on a spike.Richard Williams and Edmund York, arrested at the same time on suspicion of a separate plot to kill Elizabeth, were executed the following year.The allegation made by other Irishmen, John Danyell and Hugh Cahill (also of the Stanley regiment), from 1592 of a plot to blow up the Tower of London was brought to light, as if the plot were freshly hatched, although neither man was held in custody.