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 one, we'll take you back to the day of the collapse and hear from a first responder about his experience at the Hyatt as well as a person who lost his mother and step-father in the collapse. Find more information about the collapse on our website, kshb.com/hyatt40.