Oulson, 43, was with his wife at the Grove 16 theater in the Tampa suburb of Wesley Chapel, where they were about to watch the Peter Berg film "Lone Survivor."
A confrontation arose Monday between Oulson and a 71-year-old retired police officer when Oulson sent a text message during previews to his young daughter, police said. The former officer, Curtis Reeves, told Oulson to put away his cell phone, and a subsequent dispute ended when Reeves allegedly shot Oulson.
Oulson's wife was also shot in her hand when she raised it as the bullet was fired, police said. The single bullet then went into Oulson's chest. Reeves, a former Tampa Police Department officer, has been charged with second-degree murder.
Oulson served in the U.S. Navy from 1990 to 1997 and was an aviation maintenance administration petty officer 2nd class, said Navy news desk Lt. Richlyn Neal.
CNN's Jennifer Rizzo contributed to this report.