Discovery Best friends 14 year old Libby German and 13 year old Abby Williams went for a walk in the woods in their small town and never came home.

Their bodies were found the next day.

Where's the investigation stand now, at a loss for leads, authorities are getting help from in pursuit with John Walsh for its season finale.

Walsh's son, Callahan, goes to Delphi to tell this story.

It really pulls at the heartstrings, and this case is no different.

However, with this case, we do have a lot of evidence video audio of the suspect taken by the victims themselves, which is very interesting because even though we have that evidence, we still don't know who this individual is.

Investigators released this video that was found on Libby's phone.

They believe this is the killer, and they've been hoping someone out there will recognize him by the way he walks or talks notify authorities.

Is there normally a lot of foot traffic in this area?

Not a lot for their areas here that are very difficult.

Walking along the trails and crossing the bridge near where the bodies were found.

Walsh says he has his theories about who this killer could be.

Makes me believe that that person knew that area well, knew that train because it's very difficult terrain and had experience in that area.

Somebody read, Grew up.

There were still currently lives.

There is no doubt in my mind that that person knows those trails like the back of their hand.

Even though the case has been widely publicized, he's hoping his viewers will be able to make the difference that they have made in getting other suspects arrested.

A lot of the public knows this story.

Continue to keep it out there in front of them, really, what it's all about.

People don't forget Abby living and make sure that we can get justice for them.

Someone just needs to come forward for inside edition dot com.