"I am so shattered by these contradictions," said Suha Arafat after French experts ruled out a theory her husband had been poisoned.
"What are we supposed to think?"
She added that she did not blame anyone for his death.
Earlier this year, scientists in Lausanne said they could not rule out that Arafat was poisoned after finding elevated levels of radioactive substance polonium-210 on his remains.
However, they cautioned they could not prove the cause of his death.
The French investigation concluded that tests showed an "absence of poisoning" because of a lack of evidence "proving polonium-210 poisoning."