By Michael Johnston of ETF DatabaseNEW YORK ( TheStreet) - Polish president Lech Kaczynski died Saturday morning when his plane crashed on landing outside the western Russian city of Smolensk. Kaczynski was on his way to memorial services at Katyn, the site of a massacre of more than 20,000 Poles by Soviet agents in the 1940s. Also on board the plane, which was making its fourth attempt to land in heavy fog, were the president of the National Bank of Poland and the army chief of staff. In accordance with the Polish constitution, the Speaker of the lower house of Parliament becomes the interim head of state upon the president's death, and must call for early presidential elections within two weeks. The elections must then take place within two months of the president's death. Bronislaw Komorowski, who is expected to be a candidate in elections that would normally take place in the fall, is the current speaker of the Sejm.