Updated at 3:15 p.m.: Revised to include additional details from police.

The Perot Museum of Nature and Science is closed for the day after an employee died at the museum before it opened Tuesday.

Officers were called about 8:35 a.m. to the museum at 2201 N. Field St., where a 60-year-old man was found dead in his locked office from what appeared to be a self-inflicted gunshot wound, police said.

No one else was injured, museum officials said in a statement.

"Out of respect for the individual and the family members, the museum is closed today," museum officials said in a statement. "The Perot Museum deeply values our employees and the contributions they make. Our heartfelt condolences go to the family of this individual."

Anyone with museum tickets for Tuesday can keep the tickets and visit any time within the next 60 days, according to the museum's website.

The museum will reopen Wednesday.