Salvador Allende was the President of Chile from November of 1970 until he was overthrown by a coup in September of 1973. He died during the coup, killing himself as the military attacked the presidential palace. The cause of his death had been in dispute, but an autopsy in mid-2011 proved that he did in fact die by his own hand.
Allende is important because he was the first democratically elected Marxist leader in the Americas. Since this was during the Cold War, the United States government worked to try to prevent from becoming president and then tried to get him removed from office once he was in power.