Human Sacrifices+Philosophers

Deputy Tara Graeme was the first sacrifice. Before she was a cop, she used ot teach middle school. Scott sees her body on top of the high school's sign after Lydia calls them all because she ended up at the school when she was intending to go somewhere else.
Mr. Westover, the history teacher, is the second sacrifice. He is taken out of the school in the middle of the day. Lydia finds herself outside his room and write a 2 in the five-fold knot drawing that appeared where his class notes had been. Allison, Isaac, and Chris find him while the Darach is still tying him up.
The third sacrifice is an unnamed pianist at the memorial concert. She she plays, the piano wire breaks and slices her throat open.