 The murderer was his Irish harpist, Diarmaid O'Cairbre, who carried out the act for reasons which remain unclear.Following Aonghas' death, the crown launched a new campaign against the power of the Lord of the Isles, and Aonghas' son Domhnall Dubh was captured by Colin Campbell, 1st Earl of Argyll.Aonghas' death would see the effective end of the independent Lordship of the Isles.