A man entered Johns Hopkins Hospital with a gun early Tuesday morning and is believed to have fatally shot himself inside an emergency room bathroom, an incident that came days after the medical center held a national symposium on safety inside hospitals. The man, who was 69 years old, was found dead with a gunshot wound to his chest shortly after midnight, Baltimore police spokeswoman Sgt. Sarah E. Connolly confirmed. Police would not identify him or provide additional details of the shooting, saying it was under investigation. The man's wife identified him as Donald G. Wizeman, a tourism and marketing consultant who was living in Virginia Beach.