20/20: Season 2025, Episode 20

2025 - 20: They Know Everything

What began as the start of an exciting new college chapter quickly turned into a nightmare. When 18-year-old University of Florida freshman Christian Aguilar disappears without a trace, his tight-knit family launches a desperate search — one that soon draws in the entire Gainesville, Florida, community. As days stretch into weeks, what emerges is a dark trail of obsession, deceit and a heartbreaking betrayal that leads investigators to a killer hiding in plain sight. Now, a new investigation reveals the lengths one killer would go to try to cover their tracks and get away with murder.