Elizabeth Vargas

The trial features a bitter reunion. Elizabeth arrives from prison, her long blonde hair now shorn, and commits the ultimate act of betrayal, according to Jens, blaming him for her crime. It suddenly became real. We were going to conspire and commit murder.

The trial features a bitter reunion. Elizabeth arrives from prison, her long blonde hair now shorn, and commits the ultimate act of betrayal, according to Jens, blaming him for her crime. It suddenly became real. We were going to conspire and commit murder.

This was a time before DNA, when blood typing is the best science can do. So the prosecutor makes much of Type O blood found at the scene. Jens Ziering has type O, along with nearly 40% of the population. The prosecutor also shows the jury a bloody sock print that he said matches Jens' foot.

This was a time before DNA, when blood typing is the best science can do. So the prosecutor makes much of Type O blood found at the scene. Jens Ziering has type O, along with nearly 40% of the population. The prosecutor also shows the jury a bloody sock print that he said matches Jens' foot.

At the end of his three-week trial, the jury doesn't even need to sleep on it. We, the jury, find the defendant guilty of first-degree murder. Jens is convicted and sentenced to life in prison. He has spent nearly every day since fighting to free himself. And now he may be closer than ever.

At the end of his three-week trial, the jury doesn't even need to sleep on it. We, the jury, find the defendant guilty of first-degree murder. Jens is convicted and sentenced to life in prison. He has spent nearly every day since fighting to free himself. And now he may be closer than ever.

Still ahead, in pursuit of truth and justice, what 21st century DNA might reveal. Stay with us.

Still ahead, in pursuit of truth and justice, what 21st century DNA might reveal. Stay with us.

July 2017, not long after the 27th anniversary of Yen Tzu-Ring's conviction.

July 2017, not long after the 27th anniversary of Yen Tzu-Ring's conviction.

An unlikely team of volunteers erring supporters meets in Richmond to review what they believe is important new information.

An unlikely team of volunteers erring supporters meets in Richmond to review what they believe is important new information.

Chip Harding is a sheriff in Albemarle County, Virginia, moonlighting on the case, along with private investigator Richard Hudson. And then there's Jason Flom, the multimillionaire music executive, who, when he's not discovering multi-platinum artists, is giving a voice to the wrongfully convicted through the Innocence Project.

Chip Harding is a sheriff in Albemarle County, Virginia, moonlighting on the case, along with private investigator Richard Hudson. And then there's Jason Flom, the multimillionaire music executive, who, when he's not discovering multi-platinum artists, is giving a voice to the wrongfully convicted through the Innocence Project.

But the battle lines are drawn because in Bedford County, the original investigator, Ricky Gardner, continues to believe Zuring is guilty.

But the battle lines are drawn because in Bedford County, the original investigator, Ricky Gardner, continues to believe Zuring is guilty.

What is the physical evidence connecting Jens to this murder scene?

What is the physical evidence connecting Jens to this murder scene?

Police originally said that sock print roughly corresponded to a woman's size 7 foot, too small for Jens Ziering's size 8 1⁄2. They also point to mistakes Jens made when he confessed. He told police Nancy Hasem was wearing blue jeans. She was not. She was dressed in a housecoat.

Police originally said that sock print roughly corresponded to a woman's size 7 foot, too small for Jens Ziering's size 8 1⁄2. They also point to mistakes Jens made when he confessed. He told police Nancy Hasem was wearing blue jeans. She was not. She was dressed in a housecoat.