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Sutton Foster as Michelle Simms, far right, teaching students in a 2012 scene from “Bunheads.”

Ms Simms said Emily was agitated, shaky and started to freak out.

"She was quite delirious. She wasn't really making much sense. She was talking to people that weren't there," Ms Simms said.

Her killer Ian Simms was freed from jail without disclosing the location of her remains.

Lead for vehicle crime, Assistant Chief Constable Jenny Simms said the possession, manufacture, sale and supply of signal jammers had provided an "easily accessible tool for criminals… for far too long".