He died on 10 April 2010 in the plane crash near Smolensk, Russia, along with the President of Poland Lech Kaczyński and other senior government officials.

Following the Invasion of Poland at the beginning of World War II, he secretly recreated the scouting movement – which was banned by the Soviet authorities – and became a head of the Białystok banner of the Szare Szeregi.

The bowl splattered, the guard hid, and we sang so that I think the whole prison heard.Following the Sikorski-Mayski Agreement of 1941, he was set free and enlisted in Anders' Army.

After its evacuation from the Soviet Union, Kaczorowski joined the 3rd Carpathian Rifle Division, where he completed divisional secondary school.

He was frequently present in Poland and was treated according to the Polish law on former presidents of the state, granting him a presidential pension, Biuro Ochrony Rządu protection and a chancellery.

[6] Although he was a self-described follower of Józef Piłsudski (Piłsudczyk), Kaczorowski chose to not get involved in any partisan or strictly political activity during his retirement.

[8] Kaczorowski died on 10 April 2010 in a plane crash near Smolensk, Russia, along with the then-current President of Poland Lech Kaczyński and 94 others.

[9] On 19 April 2010, Kaczorowski's coffin was taken to St John's Cathedral for a funeral mass, before being buried in a crypt at the National Temple of Divine Providence in Warsaw.