Correct me if I'm wrong. Didn't Amanda say the killer has a emphasis on his s's and t's?
I found the quote for this, it wasn't one of the calls to Amanda in this case, but it was info from Sara Karnes, friend of Maureen Brainard-Barnes, in a phone call she received: "Karnes, who passed her information on to the police, says the man she spoke to didn’t have an accent. “He definitely isn’t from New York, Boston or Maine, because those are the strongest places the accent comes out of. But he accentuated his S’s and his T’s. He spoke properly.”
Long Island Serial Killer Case: How Close Are Authorities to Catching a Killer?