ATLANTA - Workers building a soaring pedestrian bridge plunged dozens of feet Friday when the structure collapsed at the Atlanta Botanical Garden, killing one worker and injuring 18 others. The workers were all atop the "canopy walk," an elevated pathway that reaches up to 40 feet (12 meters) high, when it gave way around 9 a.m., Atlanta fire officials said. Joggers, dog walkers and others were in an adjacent park, but no visitors were in the area of the collapse, authorities said.