Cause of death: accident
Pierre Curie ( KURE-ee; French: [pjɛʁ kyʁi]; 15 May 1859 – 19 April 1906) was a French physicist and a pioneer in crystallography, magnetism, piezoelectricity and radioactivity. In 1903, he received the Nobel Prize in Physics with his wife, Marie Curie, and Henri Becquerel, "in recognition of the extraordinary services they have rendered by their joint researches on the radiation phenomena discovered by Professor Henri Becquerel". With their win, the Curies became the first married couple to win the Nobel Prize, launching the Curie family legacy of five Nobel Prizes.
Source : Wikipedia