The mayor of the Polish city Gdansk, Pawel Adamowicz, died on Monday after being stabbed during a charity event on Sunday.
The confirmation was given by Lukasz Szumowski, Minister of Health of Poland. "We can not win," he said, according to the BBC.
According to the Polish interior minister, the mayor was attacked with a sharp object when he was on stage at the end of a solidarity event, after being admitted to a very critical state.
The suspect of the attack, 27, originally from Gdansk, was arrested on the spot.
According to the TVN station, just moments before the attack, the man would have shouted that he was detained and tortured by the main opposition party in Poland, the Civic Platform (Christian Democrats), to which the mayor of Gdansk.
Pawel Adamowicz, 53, has been mayor of Gdansk since 1998. He joined the democratic opposition in that city, still under the leadership of Lech Walesa. He is considered a progressive and tolerant politician who supports LGBT rights and respects minorities.