On July 17, 1981, two skywalks in the Hyatt Regency hotel fell onto partygoers beneath them. The accident resulted in 114 people killed and hundreds others injured. Digital producers Casey Murray and Katharine Finnerty take a look at what happened and how the disaster changed America 40 years later in this two-part miniseries. In part two, we'll take a closer look at the mistake that caused the collapse, and how fields like emergency medicine and engineering were changed because of it. Find more information about the collapse on our website kshb.com/hyatt40.