That same night their house burned down. Only three survivors, the couple and one servant.
The same day when he comes back to the house, a crowd was there looking at what appeared to be a silhouette of a hanged cat.
Some time later, he was out drinking again and he saw a black cat that reminded him of Pluto. He took him home and his wife was happy.
He then tried to kill the cat, but his wife got in the way and she got killed instead.
He then decided to hide her body. After thinking and thinking he hid her behind one of the walls in the house, but he was discovered because the cops heard a knock coming from that wall. It was the cat.
That is why he's imprisoned and sentenced to death.