 As a reward for his victory, he was appointed commandant-general by Bernardo O'Higgins, but after a coup d'état led by Luis Carrera he was exiled to Argentina in 1814, when Carrera took over power.Juan Mackenna died in Buenos Aires late in 1814, after a duel with Luis Carrera.A bust of General MacKenna was publicly presented to Monaghan County Museum on 5 August 2004 by his direct descendant .