According to the National Missing Persons Database, there are 26,403 open missing persons cases in the U.S.

A string of so-called "mysterious deaths and disappearances" prompted speculation that the incidents were connected.

Eight scientists dead or missing, with some baffling cases and unclear connections. Authorities and politicians are investigating. Cases include disappearances, unsolved deaths, and confirmed ...

Authorities searching for missing retired Air Force Maj. Gen. William "Neil" McCasland are investigating a new development after hiking boots believed to belong to the missing general were discovered ...

Add Yahoo as a preferred source to see more of our stories on Google. Her husband, Rob, has since revealed that she was found at a local Atlanta hospital by the police, per local news outlet, 11Alive ...