Lea's statements in Ghost Story
Ghost Story Spoilers
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In Ghost Story theLeanansidhe (Lea) makes 3 statements about Harry's killer
"The first truth is that you are acquainted with your killer"
"The second truth is that your murder is but one of thousands at the killers hands."
"The final truth... Your killer was but the proxy of another being and one mightier and more dangerous than he. "
All 3 statements can almost be applied to Kincaid (the one pulled the trigger) but it could be argued that they also apply to Harry himself (the one who ordered the killing)
it would be hard to argue the Harry is not at least acquainted with himself
Harry killed the entire Red Court. I would be surprised if be surprised if that wasn't thousands of vampires
Harry had been manipulated into ordering the killing by Nicodemus and when the killing took place was the winter knight and could be argued was Mab's proxy.