Terrorist's death a compelling reminder of need for vigilance
One of the most worrying aspects of Khalid Kelly's death is the apparent ease with which he was able to travel to Iraq to join up with Isil. For many years he was Ireland's highest-profile jihadist sympathiser.
Yet it appears that while intelligence services knew he had left the country in recent months, they were unsure of his whereabouts until the announcement of his suicide bombing mission near Mosul.
His ability to travel to the frontline with relative ease will raise some uncomfortable questions for the intelligence community here and abroad.