You know the more I think about two knifes being used the more I think this was done by more then one person. We know one of the knifes came from Lindy's home. I don't think I have ever heard of two knifes and one killer before, I'm sure its happened, but it just seems strange. It could account for the letter appearing to have been written by two people (clue).......unless this person has a serious split personality. For some reason I get the feeling whoever did this was really close by, lived in the apartment complex and found it easy to watch what was going on, he also found it easy to stalk her since he lived so close.