The district announced his death in a written statement, calling it a profound loss for the school system and especially for the students, faculty and staff who worked alongside him for nearly three decades.

"His passing is a tremendous loss for our district, particularly for the students, faculty, and staff who have had the privilege of working alongside him during his 28 years with Clay County District Schools," the district said. "Our thoughts and heartfelt condolences are with his family, friends, and the entire school community during this difficult time."

The district did not release a cause of death, citing the family's privacy. Grief support counselors were being made available to the Paterson community, and district officials said supporting students and staff was their top priority.

O'Brian's tenure at Paterson coincided with a period of significant recognition for the school. In 2024, Paterson was named Florida's 10th-best public elementary school and was recognized as a School of Excellence — a designation that reflects sustained academic performance and student growth.

For families on Fleming Island, O'Brian was a familiar and steady presence at a neighborhood school that serves as a community anchor. His death marks the second loss of a longtime local school leader announced the same day; Raines High School's principal in Duval County also died after nearly 30 years with that district.

Clay County school officials asked the community to respect the O'Brian family's privacy as the district begins the process of supporting Paterson's students and staff through the coming days.