I think there should be a strict law and punishment for such crimes, if government wish to reduce such instances. There should be a fear among the people before committing such cowardly crimes.
I'm in favor of Death Sentence. If the punishment for that crime is only about 5-10 years in prison. They will going to do it and more people will have the desire doing it also because the punishment will only take then years of imprisonment.
Death sentence will not stop rapists and the future rapists from doing it. Even kids nowadays raped their girl playmates. Unless your government is so strict about implementing laws in their jurisdiction.