She has told reporters the night before her husband died, she cooked a traditional Indian meal for him and their family, including Khan's daughter and Ansari's father. Not feeling well, Khan retired early, Ansari told the Chicago Sun-Times, falling asleep in a chair, waking up in agony, then collapsing in the middle of the night. She said she called 911.
Her attorney said she has nothing to do with her late husband's death and has cooperated with the authorities.
ABC News' Michael James and Alex Perez contributed to this report.