IMO, neither one of those seems like a possible signature. A pubic hair, whether left or not left at the scene, is just too common of an "item" to be signature. My understanding of signature is something that is NOT required to commit the offense but rather something that is required by the offender to fulfill his fantasy. Neither Mikie's nor Jameson's suggestion seem to fit that description.

So, what could the signature be,,,if there is one? Not the note. Not the garotte. Not the red mark on hand. So my guess is that whatever the signature is, we are missing it. What might it be?