Cat injures its owner over jealousy

A cat sent its owner to a hospital for treatment, when threatened by the introduction of another cat in the house. When a neighbour showed up at the door with another cat (thinking it was the house cat), the house cat severly attacked its owner, a lady in her 60's. The injuries were pretty serious, and the lady had to be taken to the hospital with over 20 injuries.
Now, it appears that the cat is going to be sent to a shelter since this was not the first time that such an incident happened. Read the CNN story.