Abstract: At 3:25 p.m. on March 17, 2020, Employee #1 and coworkers, employed by a construction company, were working at the intersection of two roads that had been closed off. Their assignment was to install a 42-inch corrugated plastic pipe approximately 24 feet below the surface. Employee #1 was working at the bottom of the trench and assisting the excavator operator to locate a 6-inch iron water service line that was 90 to 100 years old. A loader was being used to haul and place into the trench loose #53 stone for backfill, and dump trucks were removing spoil material. The old water main pipe broke, and the loose stone backfill on the backside of the excavation gave way and flowed into the trench, filling it with approximately 7 feet of the stone backfill. Employee #1 was caught and engulfed in the stone. A coworker went into the excavation in an attempt to rescue Employee #1 but was not successful. Employee #1 was killed.