Munro decided to stay put and made a new approach to the new regent, Matthew Stewart, 4th Earl of Lennox who supported Munro. The situation became even more complex when Lennox was also shot and killed in September 1571. The next regent, John Erskine, Earl of Mar, subsequently also gave his approval for Andrew Munro to retain possession of the castle, but the Earl of Mar died in October 1572 after a short illness which some sources indicate was due to poisoning.