The revelations followed, instilling the family tragedy with soap opera-like suspense that even attracted reporters from overseas.
Khan died without a will, opening the door to a court battle.
Under Illinois law, the money should be divided evenly between his wife and daughter, but Husain says the man's three siblings kept asking whether they had rights to the money. In their filings, Khan's siblings accused Ansari of trying to cash the lottery check and expressed concern his daughter would not get her fair share.
A judge has made Ansari the administrator until a ruling on how to divide the assets.
Khan's sister, Meraj Khan, and her husband, Mohammed Zaman, told reporters Friday that they had no suspicions before the fuller toxicology results showed cyanide poisoning.
Zaman then added yet another puzzling wrinkle: Ansari is a vegetarian and therefore would not have eaten the lamb curry she prepared for her husband the night he fell ill. Ansari has repeatedly said she, Khan, her father and Khan's daughter all ate the same meal.
Authorities have not said how they think Khan ingested the cyanide, which can be swallowed, inhaled or injected.
Detectives questioned Ansari for more than four hours at a police station in November and searched the family home.
Around the same time, Ansari's stepdaughter, Jasmeen, decided to go live with Khan's sister, who had won guardianship of the teen.
"Of course she was upset," Husain said of Ansari's reaction. "At the same time, I think she wants to move forward with her life. ... With her stepchild, her in-laws, she doesn't want to really have anything to do with them. There's some great animosities between the two."
And then there's Ansari's father. A few months before Khan's death, two federal tax liens were filed against his father-in-law, Fareedun Ansari. He owed $124,600, according to the Cook County Recorder of Deeds.
Finally, Khan's ex-wife and Jasmeen's mother emerged. Now remarried, living in South Bend, Ind., and going by the name of Maria Jones, she told the Chicago Sun-Times she last saw her daughter 13 years ago, when she says Khan took the girl to India. The distraught woman said she didn't know the girl was in the U.S. and she hoped to reconnect with her.
"I don't know if she knows I'm still alive," she told the newspaper, sobbing during a phone interview. "I thought she was in India all these years."