Cat Haven, California Sanctuary Where Lion Attacked, to Reopen Sunday

March 8, 2013— -- Cat Haven, the big cat sanctuary closed after a lion killed a volunteer intern at the facility this week, will reopen to the public on Sunday, officials said.

"During this very sad and difficult time, we have also had to turn our attention to our remaining 29 cats in our facility," said Dale Anderson, Cat Haven's founder. "It is important that we attend to their health and well-being, and we believe returning to a state of normal operations is a part of that process."

Cat Haven, located in Dunlap, Calif., will reopen to the public from 10 a.m. to 3 p.m. Sunday, according to a news release today.

The facility has been closed since Wednesday, when, at approximately 12:30 p.m., the intern, Dianna Hanson, 24, died of a broken neck when she was attacked by a lion, Fresno County Coroner David Hadden said Thursday.

It's still unclear why the lion attacked her.

Hadden told ABC News that he believed a gate or door may have been left partially open, allowing the 4-year-old male African lion named Cous Cous to attack Hanson.

"The cat had just been fed and there was food in the bowl and the cat had ignored the food in order to have access to this young lady," Hadden said Thursday night.

However, Fresno County Sheriff's Lt. Patrick Hanson told ABCNews.com Thursday night that police still were determining the circumstances of Dianna Hanson's death, and investigators "cannot confirm or deny which gates were working or which gates weren't working."

Hanson died instantly but Cous Cous caused additional wounds to the woman's body after her death.

"She did not suffer," Hadden said. "As tragic as this death is, it's important to know that she wasn't alive for a long time."

Hanson was reportedly talking on her cellphone with a co-worker at the time of the incident when the call abruptly ended, suggesting Hanson might have been completely caught off guard by the lion. The co-worker grew concerned when Hanson failed to call back, The Associated Press reported.

Another employee tried unsuccessfully to lure Cous Cous away from Hanson and into another enclosure.

Less than 30 minutes after Hanson entered the cage, Cous Cous was shot by a Fresno County sheriff's deputy who responded to a call, authorities said.

The body of the 500-pound lion was taken to a vet facility in Tulare County for a necropsy to determine what may have caused the fatal attack.

Hanson was two months into an internship program at the Cat Haven in Dunlap, a small town in Fresno County near King's Canyon National Park, when she was killed.

"Even though she was only with us for a little over two months, she was part of our family," said Wendy Debbas, the president of Project Survival Cat Haven, a non-profit group associated with the sanctuary, on Thursday. "She made instant friendships with everybody up here. Everybody loved her.

"She has songs she made up for each of the cats," Debbas told reporters. "A cute example of that is we have jaguar cubs named Samba and Rose. Samba's song was not 'La Bamba' but 'La Samba.' And Rose was 'Kissed by a Rose.' And she had songs like that for all of the cats. She was vivacious. She loved her work. She loved big cats."

Hanson's father said Thursday that she never feared working with big cats, but he always feared something might happen to her.

"Anybody who works with cats knows that they are wild animals and they can turn even on people closest to them," Hanson's father, Paul Hanson, told ABC News. "So I always had this horrible, nagging premonition that I would get a call like this."

Hanson said his daughter loved to be around big cats and that working with them was her true passion in life.