BOSTON — The last of the three Clancy children at the heart of the Duxbury tragedy has died.

“Today, at approximately 12:30 p.m., The state Office of the Chief Medical Examiner contacted Massachusetts State Police assigned to our office to report that at 11:18 a.m. today, the third Clancy child was pronounced deceased at Children’s Hospital in Boston,” the Plymouth District Attorney’s office announced Friday afternoon. “The victim has been identified as Callan Clancy.”

Callan, just 7 months old, held on for three days. His older siblings, Cora, 5, and Dawson, 3, were pronounced dead Tuesday night after Duxbury first responders found them unconscious at the home at 47 Summer St.

The events of Tuesday night, from husband Patrick calling 911 at 6:11 p.m. to report that his wife, Lindsay, had attempted suicide to first responders finding all three children unconscious has dominated headlines since that evening.

In a news conference the next day, Plymouth DA Timothy Cruz said that preliminary investigation indicated that the children had been “strangled.” Final determination of their cause of death is in the hands of the Office of the Chief Medical Examiner, he said.

An arrest warrant was issued for Lindsay Clancy that evening. The Plymouth District Court had no further information to release Friday afternoon.

The warrant shows Clancy, who remains in a hospital, with eight counts: two counts of murder, three counts of strangulation or suffocation and three counts of assault and battery with a deadly weapon. It is not immediately clear if the death of Callan will bring a fresh charge.

The “unimaginable, senseless tragedy,” as Cruz described it mere hours after first responders arrived at the home, shook the small bedroom community nine miles south of Plymouth.

First responders who worked the scene or coordinated and dispatched efforts were placed on leave to recover from what they had seen and endured, department heads announced Wednesday, and area churches opened their doors for all to heal together.

A vigil was held Thursday night.

Community members and others from near and far have contributed monetarily, as well, for Patrick to do what he needs to do, with more than $443,000 raised in just a day to a GoFundMe drive with a $700,000 goal.

“On behalf of the extended Clancy Family we invite you to offer support for Patrick as he navigates an unimaginable tragedy,” organizer Matthew Glaser, of Wakefield, wrote on the page, which he added “is intended to help Pat pay for medical bills, funeral services, and legal help. This assistance is especially needed because Pat will be unable to work for the foreseeable future as he weathers this painful, life-altering tragedy.”

Glaser could not be reached for comment Friday afternoon.