Julia Ituma had told her teammates and coach that she was unwell and texted 'goodbye' in the team's WhatsApp group before tumbling down from the sixth floor of her Istanbul hotel room.
This was reported by the Turkish newspaper Hurriyet which reconstructs the last evening of the Italian volleyball player.
Her roommate, Spaniard Lucia Varela Gomez, said: "We spoke until 1.30. Then I slept. I was informed that she had fallen in the morning."