( April 29, 2026, 10:29 AM EDT) -- BOSTON — The First Circuit U.S. Court of Appeals affirmed a lower federal court’s judgment in favor of a commercial general liability insurer in a lawsuit arising from the death of the appellant’s mother while she resided at an assisted living facility in Puerto Rico, rejecting the appellant’s argument that the lower court erred in giving Rivera-Matos v. Commonwealth of Puerto Rico “retroactive” effect in granting the judgment....