POCATELLO — A Pocatello High School custodian and Navy veteran died Tuesday morning after suffering an apparent heart attack while at work, his family told the Idaho State Journal.

Jason Dustin Johnson, 39, of Pocatello, arrived at the school around 5:30 a.m. A teacher later found him deceased inside the building and called 911. Pocatello dispatch was notified at approximately 6:51 a.m.

“It is with great sadness that we confirm a member of the Pocatello High School maintenance staff passed away early this morning while at work on campus,” School District 25 spokesperson Courtney Fisher said in a statement to the Idaho State Journal around noon Tuesday. “Our thoughts are with their loved ones. The school worked closely with emergency responders and took steps to communicate with staff, learners and families. Out of respect for the individual, their family, and the sensitive nature of this loss, we will not be sharing additional details.”

A large contingent of first responders including Pocatello police, firefighters and paramedics responded to the scene.

School District 25 notified Pocatello High School families and staff of the incident via email shortly after 8 a.m., noting there was no threat to students or staff and that school would remain in session as regularly scheduled. Portions of the campus were temporarily restricted while emergency personnel worked on scene.

Pocatello Police released a statement around 8:03 a.m. describing the incident as medical in nature, adding that no further information would be released. The Pocatello Fire Department confirmed to the Idaho State Journal around 11 a.m. that an adult male school employee had died.

Johnson’s family confirmed his identity and additional details to the Idaho State Journal around noon Tuesday. Johnson was a lifelong Pocatello resident who attended Highland High School, his family said.

Further information about his surviving family and services was not immediately available.

The Idaho State Journal will update this story as more information becomes available.