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Lindsay Clancy— Case Archive
personpersonBarbara OlsonBarbara OlsonForensic pathologist and medical examiner at the Cape Cod office of the Massachusetts Office of the Chief Medical Examiner.← All People
Expert witnessOffice of the Chief Medical Examiner

Barbara Olson

Courtroom still of Barbara Olson.

Forensic pathologist and medical examiner at the Cape Cod office of the Massachusetts Office of the Chief Medical Examiner.

Appeared2026 Criminal Trial
96 lines·2 proceedings·2 mentions

About

Barbara Olson testified for the Commonwealth on Day 12 about her January 25 autopsies of Cora and Dawson Clancy. A medical examiner at the Cape Cod office of the Office of the Chief Medical Examiner, she described horizontal ligature furrows and petechial hemorrhages in both children. She identified Cora's cause of death as asphyxia by strangulation and Dawson's as asphyxia. She could not determine the precise age or cause of Cora's bruises, and she offered more than one possible explanation for Dawson's more prominent facial hemorrhages.

Olson explained how neck compression deprives the brain of oxygen and distinguished unconsciousness from immediate death. She gave a general estimate of 10 to 30 seconds to unconsciousness with complete oxygen deprivation, while emphasizing case-specific variables. Prosecutor Jennifer Sprague challenged her answer about recovery after unconsciousness and sought impeachment through an alleged prior inconsistent statement. Several questions drew sustained objections. Olson rejected a fixed 30-second formulation, and the alleged inconsistency was not established during the exchange.

Olson also authenticated autopsy photographs. The court admitted the displayed photograph sets as Exhibits 228 and 229 over defense objection. Kevin Reddington declined cross-examination.

Trial Record (2)

2026 Trial2026 Criminal TrialJul 27, 2026 – Sep 4, 2026Called by prosecution

Barbara Olson testified about Cora and Dawson Clancy's autopsies and causes of death on Day 12. She qualified her strangulation timing estimates when the prosecutor challenged her answer about recovery after unconsciousness; defense counsel declined cross-examination.

Day 12

DirectDirect Examination - Barbara OlsonBarbara OlsonJennifer Sprague5highlightsMentioned96lines spoken

Summary

Olson described Cora's and Dawson's autopsies and causes of death, faced contested questioning about strangulation timing, and authenticated photographs admitted over defense objection.

Mentioned in this proceeding.

Highlights (5)

Quote“When I see a ligature furrow that is horizontally oriented in association with significant petechial hemorrhages, those findings are consistent with a ligature strangulation.”— Barbara OlsonConnects the observed neck and facial findings to Olson's medical interpretation.Open in transcript →Watch this moment ▶
confrontationOlson gave qualified general timelines for oxygen deprivation. Sprague sought to challenge her answer about recovery after unconsciousness with an alleged prior inconsistent statement; the court called a sidebar and sustained later questions. Olson declined to endorse a fixed 30-second death timeline.Open in transcript →Watch this moment ▶
Quote“I cannot put a specific time on it for the interval. There's multiple variables to consider in a case-by-case basis.”— Barbara OlsonExpressly limits the application of her general timing estimates to an individual case.Open in transcript →Watch this moment ▶
Show all 5 highlights
testimony highlightOlson described Dawson's neck furrow, petechial hemorrhages and bruises, explained possible reasons his facial hemorrhages were more prominent than Cora's, and identified his cause of death as asphyxia.Open in transcript →Watch this moment ▶

Day 13