CRACK THIS PUZZLE!!

CRACK THIS PUZZLE - You will find this simple and interesting if you are a Sherlock Holmes fan :) Mr. Mark was having an early walk. He had just crossed a bridge when he saw a crowd of people. Rushing to them, he found that they were crowding around a dead woman. Mark was a famous detective. He took the case and started his investigation. The woman seemed to have come for an early walk, too. Seeing her handbag lying nearby, Mark ruffled through it and found what he wanted - her identity card. Her name was Jane, and her house was about a 10 minute drive away. Her number was also written on her card. Mark phoned the given number. "Is this Jane's residence?" "Yes. And I am her husband. What do you want?" "Sir, your wife is dead." "What! No way!" "Sir, come here quickly." About 10 minutes later, a car pulled up. The husband got down, and on seeing the woman, rushed to her and started crying. Mark was about to console him when something flashed in his mind. He quickly had the husband arrested. Can you tell WHY??