A FedEx worker froze to death outside an Illinois delivery hub this week as a polar vortex plunged the region into sub-zero temperatures, according to a new report.

William L. Murphy, 69, was found dead at FedEx Freight in East Moline on Thursday morning, Rock Island County Coroner Brian Gustafson told local TV station WQAD.

Another worker found Murphy’s body between two tractor-trailers, Capt. Darren Gault of the East Moline Police Department told the outlet.

Police said the weather “is being considered by investigators as a circumstance that may have played a role in the death, but a cause of death will not be available until after the autopsy next week.”

Authorities weren’t sure how long Murphy had been there before the discovery.

Gault said there were no signs of foul play and that the weather played a role in Murphy’s death. Temperatures in the region dipped as low as negative 33 degrees that morning.

Authorities were using security cameras around the facility to aid in their investigation, according to the report.