Jennifer vanished sometime in the overnight hours.

Right now there is no trace.

Investigators say evidence leave them to believe that she's dead.

Stick my nose back in that trail. That's all I can do.

It's hard to help someone when they're already gone.

Gone.

All right.

When I started the podcast more than five years ago,

I was not keen on covering serial killers.

I didn't see the mystery to them,

and I wanted to focus more on lesser known cases.

Little did I know that there are serial killers out there

that most people don't know about.

Men and sometimes women who commit multiple murders

without being caught.

Then when they are caught, the case doesn't make huge headlines.

Be it timing or geography or the victims themselves,

somehow their killer isn't deemed particularly news

worthy.

David Spanbauer was one of those killers.

His crimes spanned four decades.

Come with me to a cold night in February of 1960,

...