Why Kristin Smart is trending

<p>Investigators searched a home on Wednesday connected to the man convicted of killing 19-year-old college student Kristin Smart in 1996, whose remains were never found. CNN's Josh Campbell explains what is known about the latest activity in the investigation into Smart's disappearance. Discover more videos, including live streams and exclusive storytelling, on our <a href="http://cnn.com/watch">Watch</a> page.</p>