CHICAGO (AP) – The wife of a Chicago lottery winner who was poisoned with cyanide said Tuesday she was devastated by his death and cannot believe her husband could have had enemies.

Shabana Ansari spoke to The Associated Press a day after news emerged that 46-year-old Urooj Khan’s death in July was the result of cyanide poisoning and not natural causes, as authorities initially concluded. Prosecutors, Chicago police and the Cook County Medical Examiner’s Office are investigating Khan’s death as a homicide, but they have not given any details, announced any suspects or said whether they believed the lottery win could have presented a motive.

Ansari would not talk about the circumstances of her husband’s death, saying it was too painful to recall. She said only that he fell ill shortly after they had dinner together.