Gretchen Harrington Tragedy: Local journalists detail new true crime book on 1975 Marple cold case
Journalists Joanna Sullivan and Mike Mathis along with Chief Brandon Graeff from the Marple Police Department join "Good Day Philadelphia," to discuss the kidnapping and death of Marple's Gretchen Harrington.
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Gretchen Harrington Tragedy: Local journalists detail new true crime book on 1975 Marple cold case
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