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Investigators are examining whether he was exposed to a substance authorities believe was fentanyl while he screening mail at the prison, the people said. The people could not publicly discuss details of the ongoing investigation and spoke to the AP on condition of anonymity.

Fischer's cause of death remained unknown Saturday and it was unclear whether the potential exposure may have contributed. Briefly touching fentanyl , and researchers have found that the from accidental exposure is low.

In a statement, the Bureau of Prisons said an employee at the prison “began feeling unwell following an exposure to mail saturated in an unknown substance� and was pronounced dead after being rushed to the hospital. A second worker was taken to the hospital for observation after coming in contact with the mail and was later released, the agency said.

“Our hearts are heavy as we extend our deepest condolences to the family, friends, and colleagues of our fallen Bureau employee,� the statement said.

His death is the latest serious incident in the Bureau of Prisons, which operates 122 federal prisons and has faced myriad crisis in recent years from and other to chronic , and .

In 2019, the agency began photocopying inmate letters and other mail at some federal correctional facilities across the country instead of delivering the original parcels, in an attempt to combat the smuggling of synthetic narcotics.

Legislation was introduced by a bipartisan group of congressional lawmakers in 2023 to require the Bureau of Prisons' director to develop a strategy to interdict fentanyl and other synthetic drugs sent through the mail to federal prisons nationwide. The bill has stalled in the House.

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Sisak reported from New York.

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This story has been updated to reflect that the last name of the mailroom supervisor who died is Fischer, not Fisher.