Koko the gorilla who mastered sign language, raised kittens and once playfully tried on the glasses of the late actor Robin Williams, has died. She was 46.

An Ohio prosecutor says he isn't seeking charges against the mother of a 3-year-old boy who got into the Cincinnati Zoo's gorilla exhibit, resulting in the shooting of an endangered gorilla to protect him.

The Cincinnati Zoo said Thursday it will re-open its gorilla exhibit next week with a higher, reinforced barrier after a 3-year-old boy got into the enclosure, leading to the fatal shooting of a male gorilla.

A prosecutor's office says police are investigating the circumstances surrounding a 4-year-old boy entering a gorilla's exhibit at the Cincinnati Zoo and the animal being shot to death to protect the child.

The Cincinnati Zoo and Botanical Garden is being slammed by animal rights advocates for killing a critically endangered gorilla after a 4-year-old boy made it past a barrier and into the gorilla's enclosure.