The man started drinking religiously, this made him get made very easily. Especially at the cat.
The man grew tired and mad at the cat until one day he just snapped and hung is loyal companion.
After their house burned the man kept going back to the same bar, but this time he saw a cat looking just like his old one. Later he took it home and his wife fell in love with the animal.
The man grew to hate the cat his wife started to love.
The man, feed up with the cat goes after it but the wife protests. The man is so filled with anger that he strikes his wife and kills her dead right there. He later hides the body in the wall.
The man was so confident in his acts that he showed the police all around the house when they showed up. There was a sound of a cat crying from the wal. The police ripped down the wall and found the cat on the dead wife's head.