Lindsay Clancy Trial: The Watch Data Prosecutors Waited Weeks to Show

Lindsay Clancy, 34, of Duxbury, Massachusetts, faces three counts of murder and three counts of strangulation, accused of killing her three children — 5-year-old Cora, 3-year-old Dawson, and 7-month-old Callan — with exercise resistance bands inside the family's Summer Street home on January 24, 2023. She's pleaded not guilty. Defense attorney Kevin Reddington is arguing insanity, pointing to severe postpartum psychosis and psychiatric overmedication.

The most compelling witness on the stand this week wasn't a person — it was a wearable device.

Digital evidence examiner Ian Whiffin testified that he built his own custom tools to extract, filter, and search data pulled from Clancy's iPhone and Apple Watch, explaining that firmware and software changes can complicate what investigators are able to recover from a device. What he recovered included heart rate readings ranging from 50 to 122 beats per minute on the day of the killings, with logging stopping at 5:23 p.m. He also detailed "flight climb" data captured on both devices — timestamps that don't match, raising the possibility of duplicated entries — alongside search history covering postpartum psychosis symptoms and depression medication.

Cross-examination chipped away at the certainty. Whiffin acknowledged Apple Health data can be inaccurate and confirmed no further activity was logged after 5:38 p.m. Reddington then pressed him on device activity recorded January 25th — a day Clancy spent unconscious in the hospital following her alleged suicide attempt. On redirect, Whiffin explained the activity could have originated from either device, that watch data can only be pulled through the synced phone, and that police handling of either device would itself generate a record.

Clancy is now paralyzed from the waist down after allegedly jumping from a second-story window. Her husband, Patrick Clancy, was running errands at the time and has since relocated to Manhattan. The trial continues in Plymouth Superior Court.

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This publication contains commentary and opinion based on publicly available information. All individuals are presumed innocent until proven guilty in a court of law. Nothing published here should be taken as a statement of fact, health or legal advice.

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