David Muir

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.

But before his day in court could actually come, the suspect, Robert Waters, does something that shocks everyone.

But before his day in court could actually come, the suspect, Robert Waters, does something that shocks everyone.

But after evading law enforcement for decades, Robert Waters never makes it back to Michigan.

But after evading law enforcement for decades, Robert Waters never makes it back to Michigan.

What would you have said to him in court?

What would you have said to him in court?

But remember, there are two cases here that have been unlocked by this new technology. And back in Beaumont, Texas, Katherine Edwards' loved ones are determined to see the suspect in that case, Clayton Foreman, the man charged with murdering her, face a jury.

But remember, there are two cases here that have been unlocked by this new technology. And back in Beaumont, Texas, Katherine Edwards' loved ones are determined to see the suspect in that case, Clayton Foreman, the man charged with murdering her, face a jury.

Prosecutors begin by playing that 911 call Catherine's parents made for the jury.

Prosecutors begin by playing that 911 call Catherine's parents made for the jury.

You know, Catherine's parents did not live to see the man accused of killing their daughter arrested. So this is left now to the twin sister, Alison, to tell jurors about her sister.

You know, Catherine's parents did not live to see the man accused of killing their daughter arrested. So this is left now to the twin sister, Alison, to tell jurors about her sister.

In a heart-crushing moment, Allison shares with the jury how she honored her sister after her death.

In a heart-crushing moment, Allison shares with the jury how she honored her sister after her death.

Excuse me. Thank you. Prosecution's next witness is about to detail the surprising connection between Katherine Edwards and Clayton Foreman.

Excuse me. Thank you. Prosecution's next witness is about to detail the surprising connection between Katherine Edwards and Clayton Foreman.

Yes. What she's about to tell the jury about his reaction to Katherine's death.

Yes. What she's about to tell the jury about his reaction to Katherine's death.

Jurors in the trial of Clayton Foreman, the man accused of killing that school teacher, Catherine Edwards, are now hearing about this investigation that took nearly 30 years, and all of it now culminating with this cutting-edge DNA testing done by that Texas lab, Othram.