Theresa A. Coen, 52 and also known as Tracy, was last heard from the evening of March 17, 2018, while staying at a rental on Penzance Road in Rockport, Massachusetts. A Charlestown resident, she apparently left the rental on foot carrying only her cell phone and keys; other personal items were left behind. Her phone was later found turned off and initial searches by Rockport police with state and municipal K9 units focused on the rugged coastline near the property.

A few days into the investigation authorities shifted from a missing person search to a recovery operation, saying they did not expect to find her alive and that foul play was not suspected. In February 2020 human remains were recovered on a Chatham beach and identified by DNA as Theresa Coen. The circumstances of how she came to be there and the cause of death have not been publicly detailed.

Did anyone in the Rockport or Chatham area see Theresa after March 17, 2018, or have information about her movements that could clarify her final days?