The mayor of the Polish city of Gdansk has died in hospital, a day after being stabbed at a charity event.
Pawel Adamowicz, 53, was attacked on stage in front of hundreds of people on Sunday.
He was taken to hospital for stab injuries and underwent five hours of surgery at a local hospital.
A 27-year-old with a criminal record has been arrested over the attack. Police believe he used a media pass to gain access to the stage.
Poland’s health minister on Monday confirmed Mr Adamowicz had died.
“We couldn’t win,” Lukasz Szumowski told local media, referring to the battle to save his life.
Thousands attended vigils across Polish cities on Monday evening, including in Gdansk.
President Andrzej Duda described the attack as an “evil hard to imagine”.
The mayor was stabbed on Sunday while attending the Great Orchestra of Christmas charity – an annual event where volunteers raise money for medical equipment in hospitals.
Television footage from the event showed the suspect rushing the stage and stabbing the mayor several times.
He then shouted to the crowd before being tackled to the ground and arrested.
Paramedics tried to resuscitate Mr Adamowicz at the scene, before transferring him to a hospital.