Two lions at the Dallas Zoo killed a lioness Sunday afternoon.
Crowds of zoo goers witnessed the deadly attack.
No people were hurt, but many were stunned by what they saw.
"We think he just grabbed her by the throat and it was very quick," said Lynn Kramer with the Dallas Zoo.
An attack so quick - the afternoon turned to chaos.
"There was (sic) some zookeepers running around, trying to understand what was going on, and yelling the names of the lions," recalled witness Dylan Parker.
These lions, some of the animal kingdom's most social cats, were born in captivity and lived as a pride for three years until something made one of the males and then another, snap.
"You could see the larger male lion kind of attacking the smaller lioness, and they were just going at it nonstop," continued Parker.
"You could see this lion holding the other one down. There was no blood, but it held her down for about 10 to 15 minutes until she was lifeless," said witness Michael Henshaw.
Warren Bethel at the zoo with his son says zookeepers rushed in, putting up barriers. "And then they asked us to the leave the deck, so it was pretty obvious something major was going on."
But by the time they reached Johari, a zoo staff favorite, the five-year-old was gone.
Lynn Kramer with the Dallas Zoo said, "I've been in the zoo business for over 35 years, I've worked at five major zoos, and I've never seen a cat kill another cat before."
As for what will happen to the two males, zoo staff says under no circumstance will they be euthanized.
But right now they are separated and only the remaining females will be exhibited on Monday.