David Muir

Investigators working the cold case murder of Kathy Schwartz, the young Michigan mother who was murdered, her baby right nearby, they had sent off the perpetrator's DNA taken from her pink phone to that lab in Texas, Othram. So after three decades with no arrests in this case, Othram actually uses their cutting edge technology to build a comprehensive DNA sequence of who the perpetrator is.

So now that you have this sequencing that they just didn't have access to years ago, what do you then do with that?

So now that you have this sequencing that they just didn't have access to years ago, what do you then do with that?

We could use that profile to search a database of people. And in doing this, we can then begin to figure out how these people that are near relatives are arranged on a family tree. And if we can do that, then we can begin to ask where the person that we're looking to identify might fit on the tree.

We could use that profile to search a database of people. And in doing this, we can then begin to figure out how these people that are near relatives are arranged on a family tree. And if we can do that, then we can begin to ask where the person that we're looking to identify might fit on the tree.

In going down the family tree, you find that there is actually a family that lives in Three Rivers, Michigan, a mother and father with four sons.

In going down the family tree, you find that there is actually a family that lives in Three Rivers, Michigan, a mother and father with four sons.

That's correct.

That's correct.

we were very excited because now we have leads to run off from we are very quickly be able to eliminate barry because his dna that was in codas and they're able to rule him out so they take him right off the list detectives then track down two more of the waters brothers who both quickly agree to turn over their dna one two three four and with that dna they're able to eliminate them as well which just left robert waters

we were very excited because now we have leads to run off from we are very quickly be able to eliminate barry because his dna that was in codas and they're able to rule him out so they take him right off the list detectives then track down two more of the waters brothers who both quickly agree to turn over their dna one two three four and with that dna they're able to eliminate them as well which just left robert waters

And from what detectives can tell from looking at his wife's Facebook page, Robert Waters appears to be a happily married family man.

And from what detectives can tell from looking at his wife's Facebook page, Robert Waters appears to be a happily married family man.

After initially not showing at the police station, detectives call Waters. He's informed that they have a warrant for his prints and his DNA. And later that day, he actually comes in.

After initially not showing at the police station, detectives call Waters. He's informed that they have a warrant for his prints and his DNA. And later that day, he actually comes in.

Unfortunately, at that police station, they're having trouble actually getting a clean print from Waters.

Unfortunately, at that police station, they're having trouble actually getting a clean print from Waters.

So you've got the detectives now waiting for a definitive answer from the lab in Michigan. So they spend the next five hours actually making small talk with Robert Waters.

So you've got the detectives now waiting for a definitive answer from the lab in Michigan. So they spend the next five hours actually making small talk with Robert Waters.

But investigators always believe that Kathy Schwartz must have known her killer in some way. You'll remember there was no forced entry. And they finally discover the connection when they go back to speak to Kathy's one-time fiancé, Mike Warner.