An investigation is underway after an 18-year-old high school senior died aboard a Carnival cruise ship. Detectives are reviewing video from the ship and interviewing passengers as the victim's family searches for answers. David Muir reports. https://abcnews.go.com/ | ABC World News Tonight with David Muir

In this tense showdown, will USA's Andrew Basso escape the water tank in time? 😬 | Guinness World Records

Miloš Křeček has been a LEGO enthusiast since he was five years old. Now he has the world’s largest collection. | Guinness World Records

HAPPENING NOW: President Trump signs an executive order on foster care. Follow live updates: https://abcnews.go.com/Politics/live-updates/trump-admin-live-updates-trump-blames-democrats-massive/?id=127478903 | ABC World News Tonight with David Muir