Aaron Katersky reports on the newly released video that shows the chilling moments after UnitedHealthcare CEO Brian Thompson was shot and killed outside a New York City hotel; Trevor Ault has details on the harrowing 911 calls placed during the catastrophic Fourth of July flood that killed 27 girls and camp counselors in Texas; David Muir looks back at life of architect Frank Gehry, one of the world's most celebrated architects who has died at age 96, and the legacy he's left behind through his global masterpieces; and more on tonight’s broadcast of World News Tonight with David Muir.

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