CHICAGO – In the week since news surfaced that a Chicago man was poisoned to death with cyanide just before he was to collect a lottery payout, surprising details about his convoluted family saga have trickled out daily.

Urooj Khan’s widow and siblings fought for months over the businessman’s estate, including the lottery check. His father-in-law owed tens of thousands of dollars in taxes. His 17-year-old daughter from a previous marriage had moved out of her stepmom’s home and into his sister’s after his death. Then his ex-wife came forward, announcing in anguish that she hadn’t seen her daughter in more than a decade and hadn’t even known she was still in the U.S.

The slowly emerging family backstory and ever-expanding cast of characters have added layers of intrigue to a baffling case in which authorities have revealed little and everyone is wondering: Who did it?