CHICAGO (WIFR) -- Just one day after cashing in a million dollar lottery ticket, a Chicago man was pronounced dead. Now police say it may have been murder.

Back in July, a coroner originally found that Urooj Khan died of natural causes, but when a relative asked for a deeper investigation, a full toxicology report revealed Khan had been given a deadly amount of cyanide.

Now police say they will exhume his body and reclassify the death as a homicide.