Belgian scientist and winner of the Nobel prize for Medicine, Christian de Duve, has died at the age of 95 after committing euthanasia, his family said.
Mr de Duve was the second well-known Belgian to choose mercy killing after the death in 2008 of writer Hugo Claus.
He died on Saturday, his family said.
Belgium was the second country in the world after the Netherlands to legalise euthanasia in 2002.
"It would be an exaggeration to say I'm not afraid of death, but I'm not afraid of what comes after because I'm not a believer," Mr de Duve told Belgian newspaper Le Soir last month.
"When I disappear I will disappear, there'll be nothing left."
Mr de Duve had decided to commit euthanasia after suffering a fall in his home but was awaiting the arrival of his son from the United States in early May in order to die surrounded by family.
"He left us serenely and refused to take anti-anxiety pills before the final injection. He left with a smile and a good-bye," his daughter Francoise told Le Soir.
Mr de Duve, who studied medicine and chemistry, picked up the 1974 Nobel with fellow Belgian Albert Claude and American George Palade for research on cancer.