His wife, Lawanda Brown, said they were working on a project for their business when Brown asked her to search in Google for a project template, according to a report from the Nassau County Sheriff's Office.
While searching, she said she could hear in the tone of her husband's voice that he was unhappy with her. She said she remembers him walking out of the office and then her memory is a blur.
According to the sheriff's office, deputies found him lying in a pool of blood from a gunshot to the back of the head.
Deputies reported finding a .38-caliber revolver in the bedroom of their home.
A medical helicopter took Brown, 58, to University of Florida Health Hospital in Jacksonville with critical injuries.
Lawanda Brown was booked into the Nassau County Jail on a charge of attempted murder. Her bond was set at $500,000.
Tony Brown grew up in Cincinnati and was the Uptown Consortium's first president and CEO. Cincinnati Children's Hospital Medical Center, Cincinnati Zoo and Botanical Garden, UC Health, TriHealth and the University of Cincinnati formed the organization in 2004 to coordinate development in the surrounding neighborhoods.
The New York Post reports he also was nominated in 2001 by President George W. Bush for a position in the US Treasury Department. After leaving Cincinnati, he was director of the Riviera Beach Community Redevelopment Agency in Florida.