"I do think Karr is a serial killer "at this point"
I'm still withholding judgement on this particular case regarding Karr. But, I've spent the last couple of days reading about these types and Karr fits right in with them. Everyone keeps saying that he's only fantasizing, and bragging. That's a common trait of serial killers. They are fueled by fantasization, and they love to brag. They also get off on almost telling the truth, but withholding just a little bit, because this way they still retain power and leverage. It's a gigantic ego thing.
the way she was killed was very sadistic and he enjoyed what he did her.
I found it very hard to believe that the perp did not take a "trophy" item with him or that did not leave something for police to find.
the missing item or the clue he left behind may have not been discovered right away and most likely it was never leaked out.