Shama-il Tirmidhi Chapter 53, Hadith Number 13 (380).

Anas Radiyallahu ‘Ahu reports that when Rasulullah Sallallahu ‘Alayhi Wasallam was experiencing severe illness, Faatimah Radiyallahu ‘Anha said: “Haai, the sickness of my father”. Nabi Sallallahu ‘Alayhi Wasallam thereupon said: “After this day your father will not experience any difficulties. Verily that inevitable thing has descended on your father today i.e. death-which till the day of qiyaamah will not be averted by anyone”.

Commentary
The word ‘Haai’ is used to express distress and sorrow. Here she meant to express sorrow.