Wow. That's intense, as it should be. I'm not sure what to make of one thing in the first paragraph: "Let me begin by introducing myself, although, I am sure you know who I am. I am Charlene Spierer, Laurens mother. Perhaps we have met...."
It strikes me that she's addressing one POI, but not one particular POI. I suppose it could be a collective "you," but I don't get that sense.....g.
She obviously addresses the letter to Lauren's killer (as by now it is almost certain that she is not alive after all that time, so someone killed her). The letter is heartbreaking and upsetting. It reflects the desperation of a mother who was hoping that someone who may be involved will talk somehow because they have feelings and some integrity. Unfortunately, murderers dont think that way, in most cases they only care to cover up the crime and avoid the consequences. We dont know who committed that crime. It could be someone unknown, a stranger whose name has not surfaced yet. In any case, one can not and should not hope that the murderer will talk voluntarily. Hopefully the Bloomington police is closing on the case and one can only hope that they will make an arrest one of these days. Or that someone will give a tip to the police that will lead to the arrest of the killer.