No cyanide remained in the exhumed body of Illinois lottery winner Urooj Khan, preventing investigators from determining how the toxin entered his body, the Cook County medical examiner said Friday.

Still, Dr. Stephen Cina maintained his determination from January: that blood samples taken after Khan's death in July show the 46-year-old died of cyanide poisoning, and that the manner of death was homicide.

Officials in January exhumed the body of Khan - who died the day after the Illinois lottery issued him a check for about $425,000 for winning a scratch-off game - hoping to determine how cyanide entered his system.