Many people helped by Dignitas are those who have travelled to Switzerland because assisted dying is not permitted in their own countries.

Across his life, Minelli campaigned passionately for the right to die, giving Dignitas the slogan “dignity in life, dignity in death”.

In a 2010 interview with the BBC, he said: “I am persuaded that we have to struggle in order to implement the last human right in our societies. And the last human right is the right to make a decision on one’s own end, and the possibility to have this end without risk and without pain.”

Minelli began his career as a journalist, working as a correspondent for the German news magazine Der Spiegel, before studying law and taking an interest in human rights.

After founding Dignitas he faced numerous legal challenges, making multiple successful appeals to the Swiss supreme court.

In a statement, Dignitas said his work had had a lasting influence, pointing to a 2011 ruling by the European Court of Human Rights, in which it confirmed the right of a person capable of judgement to decide on the manner and the time of their own end of life.

Euthanasia – when a lethal drug is administered by a physician to deliberately end a person’s life to relieve suffering – is illegal in Switzerland.

But assisted dying, in which a person receives lethal drugs from a medical practitioner which they then administer themselves, has been legal for decades.

Dignitas said in a statement that it would continue to “manage and develop the association in the spirit of its founder as a professional and combative international organisation for self-determination and freedom of choice in life and at the end of life”.

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