Transcript for Lottery Winner Murdered: Widow Questioned By Police
lottery winner, poisoned just after hitting the big jackpot. There's no official suspect. Now, there is a move to re-examine the body as a battle over his estate rages on. Alex perez has all of the details from chicago. Reporter: In just a few hours, investigators will be asking a judge to exhume urooj khan's body, hoping to get answers from the grave. This morning, the mystery over who may have poisoned urooj khan is growing deeper. His widow, still working at the couple's dry cleaning business, declined to speak to abc news. Police are not calling her a suspect. But her attorney says investigators questioned her for more than four hours and filed a warrant to search the couple's home. Absolutely, positively, she had nothing to do with her husband's death. Reporter: Khan won a million-dollar lottery jackpot in july. After picking up his check, his wife says he came home. They ate dinner and went to bed before he cashed the check. After a concerned family member demanded more tests, authorities found a lethal amount of cyanide in his blood, turning the case into a homicide investigation. If you think of someone who's drowning, they don't have oxygen in their brain for four minutes. Reporter: Khan did not have a will. And his widow is in a legal fight with his siblings for over $1 million of his lottery winnings, as well as his business and real estate holdings. Court documents show ansari may have tried to cash the check after khan's death. Those documents show khan's family is questioning if the couple was ever legally married. Asari said they were. It turns out to be somebody did that intentionally, I think she is shocked anybody would do that. Reporter: And there's also word this morning that khan's father-in-law owed more than $100,000 in back taxes. All eyes will be on that motion in court today. If the judge approves it, khan's body could be exhumed in the next two weeks. Alex, thanks very much.
This transcript has been automatically generated and may not be 100% accurate.