A TERRIBLE CRIME, TWO SETS OF SUSPECTS, TWO CONFESSIONS... WHO REALLY KILLED A WELL-LOVED NEBRASKA COUPLE?

"20/20" Airs on Friday, September 3 on ABC

"It was like something out of Truman Capote's 'In Cold Blood,'" says Crime Scene Investigator David Kofoed. Well-loved couple Wayne and Sharmon Stock were found viciously murdered in their Nebraska farmhouse on Easter Sunday in 2006. For the legendary Kofoed, the crime had all the earmarks of a revenge killing. The tiny town of Murdock, Nebraska, where many hadn't locked their doors for years, was in utter disbelief. But soon there would be two bewilderingly different first-hand accounts of the murder, and two videotaped confessions -- by completely different people. One would turn out to be completely innocent. Deborah Roberts' report airs on "20/20," FRIDAY, SEPTEMBER 3 (10:00-11:00 p.m., ET) on the ABC Television Network.

Every day police across the country face the daunting challenge of distinguishing false confessions from real ones. Were the murderers the Stocks' own nephew and a partner, or two complete strangers -- 17-year-old Jessica Reid and her boyfriend, Gregory Fester, two teenagers on a joy-riding crime spree? In a case that highlights the fragility of justice, authorities reluctantly had to face the fact that they'd arrested two innocent men, and possibly coerced a false confession. Even harder to face: the legendary Kofoed had apparently planted evidence to buttress one of the confessions.

The report includes an interview with CSI Kofoed, Jessica Reid, as well as interrogation video and never-before-seen police crime scene photos and videos.

"20/20" is anchored by Elizabeth Vargas and Chris Cuomo. David Sloan is executive producer.