A female bottlenose dolphin died Tuesday at Dolphinaris Arizona, staffers with the dolphin attraction said.
Alia, a 10-year-old bottlenose dolphin, "had displayed some unusual behaviors in the last few days" and "was being monitored," Jen Smith, a spokesperson for the attraction said in a written statement.
She is the second dolphin to die at the facility in less than a year.
In September, Bodie, a male bottlenose dolphin, died at the facility from a "rare muscle disease," the facility said then.
An exact cause for Alia's death was not immediately known, Smith said. The facility would conduct a necropsy, an autopsy for animals, to try and determine a cause of death, she said.
She said Alia was with her caretakers and the other dolphins when she died.
"Alia will be greatly missed. She was a lively and loving part of the Dolphinaris family," a statement said.
The facility opened in October 2016 at the Odysea in the Desert complex near Loop 101 and Via de Ventura. It is part of the Salt River Pima-Maricopa Indian Community.
At Dolphinaris, people pay for different interactive experiences with the dolphins both in the water and out of the water.