What was the cause of death of XXX?
Ryszard Siwiec
Ryszard Siwiec (Polish pronunciation: (ˈrɨʂart ˈɕivjɛt͡s); 7 March 1909 -- 12 September 1968) was a Polish accountant and former Home Army resistance member who was the first person to commit suicide by self-immolation in protest against the Warsaw Pact invasion of Czechoslovakia.
suicide