 He was also a member of Sejm 2001–05.He was listed on the flight manifest of the Tupolev Tu-154 of the 36th Special Aviation Regiment carrying the President of Poland Lech Kaczyński which crashed near Smolensk-North airport near Pechersk near Smolensk, Russia, on 10 April 2010, killing all aboard.On April 16, 2010 Dolniak was decorated posthumously with the Commander's Cross of the Order of Polonia Restituta.