The Death Story

One misty night, a young writer was travelling from Kalka to Mumbai in train. He was enjoying his cold journey when a young beautiful woman entered his compartment. To pass time, she offered to tell him a story. He hesitated at first, but he agreed later. The rest of the night, she told him a story about a woman who never wanted to kill her husband but ended up murdering him. So what was the reason behind murdering him? Lets find out.