David Casavant

Dr. David Casavant testified for the Commonwealth on Day 5 about Callan Clancy's intensive-care treatment. He took over Callan's care on January 26, 2023, and described unusually early, extensive brain swelling, no response to painful stimulation, and pupils that did not react to light. Callan had a breathing tube but was not receiving sedation. Casavant attributed the brain injury to oxygen and blood-flow deprivation rather than direct trauma to the brain.

Casavant described observing the neurology team's brain death testing. An initial apnea test reached 59.7, just below the required threshold of 60, so he repeated that portion later that day, reaching 87. He explained that precise thresholds and repeat testing after at least 24 hours helped exclude uncertainty and lingering medication effects.

Casavant testified that the following day's results remained consistent with death by neurologic criteria. Life support ended on January 27 after consultation with Callan's father and an opportunity for family members to see him. The court then admitted two volumes of Callan's Boston Children's Hospital records as Exhibit 137 A and B without defense objection. Casavant did not address who caused the oxygen deprivation or Lindsay Clancy's mental state.