Oxford school announced an employee at Oxford Middle School died in the building on Thursday.

According to a letter sent to parents and staff, the employee, presumed to be a custodian, was found in a room not accessible to students.

“We can share that the employee did not work directly with students,” the letter said. “Our hearts are with the family during this incredibly difficult time.”

The district said they had no further information, but the sheriff’s office said the man’s death is not considered suspicious and appears to be natural causes.