A 20-year-old killer whale named Taima has passed away while giving birth at SeaWorld Orlando. Her calf was stillborn. The mother whale died late Sunday afternoon, twenty hours after going into labor.

Dold said Taima’s fetus was in an unusual position in the birth canal during the delivery process. The orca also experienced a condition in which the placenta was delivered before the fetus itself.

After Taima was unable to deliver her calf, park veterinarians attempted to assist. But SeaWorld said the complications ultimately proved too severe.

Taima, which means “thunder” in Icelandic, was one of eight whales at the SeaWorld Orlando theme park. She had successfully given birth to three calves during her lifetime, herself born in captivity.

Despite criticism of the theme park company, a killer whale mother had not died while giving childbirth in 25 years. The company has successfully carried out 26 births since 1985.