Holy Planet of the Apes!
I was watching the news and this just came on.

Apparently, the chimp knew the friend for years, but they think that he may not have recognized her because she changed her hair color.
Chimp Mauls CT Woman
STAMFORD -- A woman whose 175-pound chimpanzee attacked her friend Monday afternoon tried to stop the attack by stabbing her pet primate with a butcher knife, police said.
As police arrived to clear the way for emergency medical workers to treat the seriously injured friend, the chimp, Travis, revived and opened the door of the police cruiser.
The officer inside fired several shots, killing the chimp.
Travis' owner, Sandra Herold, and two officers also were hurt, though the extent of their injuries wasn't clear.
Travis was known around Stamford for years because he rode around in trucks belonging to Herold's towing company, Desire Me Motors in Stamford.
The attack occurred outside Herold's home at 241 Rock Rimmon Road. The friend's name, age and hometown are not known. She was very badly mauled by the chimp, police said.
Herold apparently called 911 when she went into the house to get the butcher knife, police at the scene said.
Travis, who was known for liking police officers, tried to open the passenger door of the cruiser, smashing the side-view mirror. When he couldn't get it open, the chimp went around to the driver's-side door and opened that. That is when the officer shot him several times.
"He had no choice but to pull his pistol and fire several rounds," Capt. Richard Conklin said of the officer. "The EMS personnel were reluctant to go in because there was an enraged chimpanzee on the loose."
Woman 'very badly mauled' by chimpanzee in North Stamford - Greenwich Time