The Mirage Secret Garden and Dolphin Habitat attractions remain shuttered since closing in late September after the death of three animals over a six-month period, and given the impending ownership change at the 33-year-old Las Vegas Strip resort, the well-known amenities might never reopen.

Eleven-year-old bottlenose dolphin K2 died on September 24 at the habitat after receiving treatment for a respiratory illness. In a letter to the facility’s staff, interim resort president Franz Kallao noted that the Mirage team was working with veterinary and pathology experts to determine the cause of death, and with additional experts to conduct a thorough inspection of the animals and the facility while it closed temporarily.