Abstract: At 1:45 p.m. on November 9, 2020, Employee #1 and a coworker, employed by a roofing contractor, were working on the roof of a warehouse as part of a four-building roof repair project that included replacing, repairing, covering, and weatherproofing skylights that had become brittle and were leaking. Employee #1 and the coworker were preparing the roof for the removal and replacement of an old skylight. The skylight consisted of an approximately 4 feet by 10 feet sheet of corrugated translucent fiberglass that was flush with the roof sections, with no surrounding protection. As Employee #1 walked across the roof to attend to a work task, he stepped onto the brittle fiberglass skylight. The skylight broke and collapsed, and Employee #1 fell through the hole to the concrete warehouse floor. Employee #1 sustained blunt force traumatic injuries and was killed.