A Brutal Murder, a Wearable Witness, and an Unlikely Suspect
‘As Karen’s body was unzipped from the body bag and laid out at the morgue, the coroner took note of a black band still encircling her left wrist: a Fitbit Alta HR—a smartwatch that tracks heartbeat and movement. A judge signed a warrant to extract its data, which seemed to tell the story Karen couldn’t: On Saturday, September 8, five days before she was found, Karen’s heart rate had spiked and then plummeted. By 3:28 in the afternoon, the Fitbit wasn’t registering a heartbeat.’


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