CHICAGO (AP) – A judge Friday granted prosecutors permission to exhume the body of a Chicago lottery winner who was fatally poisoned with cyanide just as he was about to collect his $425,000 payout.

Authorities want to do a fuller autopsy on Urooj Khan to confirm earlier but less-thorough toxicology tests, as well as to rule out that natural causes contributed to the 46-year-old’s sudden death, according to documents filed with the motion for an exhumation.

Facing dozens of reporters and TV cameras crowded around her outside court after a judge signed off on the request, Khan’s sister said the thought of her brother’s body being unearthed and re-examined was disturbing – but that the procedure was essential.