LONDON — On the eve of his death, David Goodall, 104, Australian scientist, father, grandfather and right-to-die advocate, was asked if he had any moments of hesitation, “even fleeting ones.”

“No, none whatever,” Mr. Goodall said in a strong voice. “I no longer want to continue life, and I’m happy to have a chance tomorrow to end it.”

Mr. Goodall spoke on Wednesday before a phalanx journalists and photographers in Basel, Switzerland. That the inquisitors had come from around the globe to hear what would be most likely the last public words of the man once called Australia’s oldest working scientist was evidence that his campaign to end his life had captivated audiences worldwide.

On Thursday, Mr. Goodall died about 12:30 p.m. local time, according to Exit International, a right-to-die organization of which he had been a longtime member.