I'm writing you a letter to make you know that these days will be your last days before you die.
You know abut our relationshpi, I hate you and that you hate me. I'm a murder. I kill people to make Dr Jeckyll life impossible. And you will not help him.
You wil help me. You will lose the trial and you will disappear from Dr Jeckyill life. It's easy, it's like that. You can't change it, if you want to stay alive.