Konstantin Chernenko rose to power as the Soviet leader after Yuri Andropov's death from complications of kidney and heart disease after just 15 months in office. Chernenko's appointment was contested by Mikhail Gorbachev, who formed a temporary alliance with another reformer, but Gorbachev allowed Chernenko to lead knowing he would succeed the aging leader. However, Chernenko himself only led for 13 months before dying in office, paving the way for Gorbachev to become the new Soviet leader.