An 11-year-old dolphin has died at the Mirage Secret Garden and Habitat.K2, a bottlenose dolphin, died Saturday, the company announced Sunday afternoon. The company’s statement said he had been receiving treatment for a respiratory illness.

The attraction was temporarily closed as the company investigated a specific cause of death.

K2 is the third dolphin to die at the Secret Garden this year. Bella, a 13-year-bottlenose dolphin, died in April after undergoing treatment for gastroenteritis. Maverick, a 19-year-old bottlenose dolphin died earlier this month following treatment for a lung infection.Mirage’s Interim President Franz Kallao said in a statement: “All of us are heartbroken over this tragic loss, especially our amazing animal health and care teams who love and care for our animals on a daily basis.”