Transcript for Promising Lives Cut Short in Amtrak Train Tragedy
over. Focus now shifting to the eight victims. The young naval student, the mom who was a CEO. David Wright begins tonight with the son who just last night was still looking for his dad. My name is Marc Gildersleeve. Please help me find my dad. Reporter: A 13-year-old boy, holding a poster of his missing father. If you know any information, please call these Numbers. Reporter: Today, he got the news he was dreading. We must now report that we have confirmed eight deceased from this horrible tragedy. Reporter: Among them, macrk's dad, bob Gildersleeve, at 45 years old. Tonight, his wife said they just celebrated their 18th wedding anniversary. And Rachel Jacobs, CEO of a tech startup, whose friends and family were searching for her just last night. I think we're in the just try to find her mode without thinking of the worst case scenario right now. Reporter: 47-year-old laura Finamore was a corporate real estate executive, on her way home from a memorial service. Derrick Griffiths, a popular dean at the city university of New York. He had just earned his ph.d last month. Today, at the U.S. Naval academy, classmates are mourning the youngest victim, 20-year-old Justin zemser. He was always have a good time, always laughing. He just had an aura about him. Reporter: So many families and friendships shattered by this terrible train wreck. David, none of them ever imagined their lives would end here. All right, ABC's David Wright in Philadelphia. David, thank you.
This transcript has been automatically generated and may not be 100% accurate.