I wouldn't even really believe this. I don't, actually. A spirit needs so much manifested energy to even scratch a person. But to kill??
I used to, in fact, believe these, but I had to get on the logical side of them. It doesn't matter how much of a believer you are, just try to think about it in a logical way. I've gotten so many of these sort of chain letters sent to me. I haven't died yet.
I am a very spiritual person, but like I said, a spirit would have to manifest itself over tenfold to kill someone. These chain letters are made to scare people. You shouldn't stoop to such a level.