Found a great recap on Wikipedia:
Travis the Chimp
A snippet:
2009 attack
On February 16, 2009, at around 3:40 p.m., Travis attacked Sandra Herold's 55-year-old friend Charla Nash, inflicting devastating injuries to her face and limbs.
Travis had left the house with Sandra Herold's car keys, and Nash came to help get the chimp back in the house; upon seeing Nash holding a
Tickle Me Elmo—one of his favorite toys—Travis flew into a rage and attacked her.
Travis was familiar with Nash, who had also worked at the Herolds' towing company, although Nash had a different hairstyle at the time of the attack, which may have confused and alarmed him. He had been taking medication for
Lyme disease.
Herold, then 70 years old, attempted to stop Travis by hitting him on the head with a shovel and stabbing him in the back with a
butcher knife. Herold later said, "For me to do something like that—put a knife in him—was like putting one in myself". The chimp turned around, she said, as if to say, "'Mom, what did you do?'"
The animal grew angrier. Herold, at this point believing Nash to be dead, then called
9-1-1 and pleaded for help. Travis' screams can be heard in the background at the start of the tape as Sandra pleaded for the police, who initially believed the call to be a hoax, until she started screaming, "He's eating her!"
Emergency medical services waited for police before approaching the house. Travis headed towards the police car when it arrived, tried to open a locked passenger door, and smashed a side-view mirror. Then he went around to the driver's-side door and opened it, at which point Officer Frank Chiafari shot him several times. Travis retreated to the house, where he was found dead next to his cage.