The body of a Chicago man poisoned with cyanide after winning the lottery will be exhumed as authorities try to figure out exactly how he died.

The Cook County medical examiner plans to exhume the body of Urooj (oo-ROOJ') Khan on Friday morning from a Chicago cemetery.

Khan died in July as he was about to collect $425,000 in lottery winnings. His death was initially ruled a result of natural causes, but a relative pressed for a deeper look.

Full toxicology results revealed in November that Khan was poisoned. His death was reclassified a homicide.

Authorities hope a forensic autopsy will produce more evidence and tests on Khan's organs may determine whether the poison was swallowed, inhaled or injected.

The medical examiner expects to finish the autopsy Friday.