On 10 July 2006, Kaczyński appointed his brother as Prime Minister of Poland upon the resignation of Kazimierz Marcinkiewicz, the brothers then became the first pair of brothers in the world to serve as president and Prime Minister of a country and the only twin brothers to achieve the feat, until 2007, when his brother lost the parliamentary election on 21 October 2007, finishing a distant second behind the conservative-liberal party Civic Platform. His brother was succeeded as prime minister by his former presidential rival Donald Tusk. On 10 April 2010, Lech Kaczyński was killed, along with his wife, in the crash of a Polish Air Force jet that occurred on a landing attempt at Smolensk North Airport in Russia. He was the first Polish president to die in office since the assassination of Gabriel Narutowicz.