Elizabeth Vargas

As the Whitakers unknowingly celebrate Bart's bogus college graduation at a popular Cajun restaurant, Steve Champagne watches from the parking lot. Meanwhile, Bart's roommate, Chris Brashear, hides in Bart's SUV outside the Whitaker home.

As the Whitakers unknowingly celebrate Bart's bogus college graduation at a popular Cajun restaurant, Steve Champagne watches from the parking lot. Meanwhile, Bart's roommate, Chris Brashear, hides in Bart's SUV outside the Whitaker home.

Unaware of Champagne's confession, Chris Brashear agrees to an interview, but quickly becomes very uncomfortable.

Unaware of Champagne's confession, Chris Brashear agrees to an interview, but quickly becomes very uncomfortable.

To Sergeant Slott, Steve Champagne's confession yields the one thing that links this trio to the crime. He mentions a key piece of evidence that only the police knew about, a single glove dropped by the shooter found beside Bart's SUV.

To Sergeant Slott, Steve Champagne's confession yields the one thing that links this trio to the crime. He mentions a key piece of evidence that only the police knew about, a single glove dropped by the shooter found beside Bart's SUV.

But Sergeant Slott still has no physical evidence to link Bart to the murders, until now.

But Sergeant Slott still has no physical evidence to link Bart to the murders, until now.

Down below, a dive team discovers a duffel bag. In the soggy bag, a treasure trove of decomposing evidence. It's a windfall for crime lab investigator Max Hunter, beginning with an innocuous-looking plastic water bottle.

Down below, a dive team discovers a duffel bag. In the soggy bag, a treasure trove of decomposing evidence. It's a windfall for crime lab investigator Max Hunter, beginning with an innocuous-looking plastic water bottle.

Among the other items in the bag, a rare brand of ammunition identical to the fatal bullets. A glove that matches the one found at the crime scene. A pry tool that matches the marks on the Whitaker's safe. A badly damaged cell phone. A lab in England identifies Bart Whitaker as its owner. Finally, Sergeant Slott has the physical evidence he needs to link Bart to the murders.

Among the other items in the bag, a rare brand of ammunition identical to the fatal bullets. A glove that matches the one found at the crime scene. A pry tool that matches the marks on the Whitaker's safe. A badly damaged cell phone. A lab in England identifies Bart Whitaker as its owner. Finally, Sergeant Slott has the physical evidence he needs to link Bart to the murders.

But where is Bart Whitaker? Sergeant Slott obtains an arrest warrant, but he doesn't know that Bart, now known as Rudy Rios, is hiding in Mexico. And then the biggest break of all, a phone call from the real Rudy Rios when we come back.

But where is Bart Whitaker? Sergeant Slott obtains an arrest warrant, but he doesn't know that Bart, now known as Rudy Rios, is hiding in Mexico. And then the biggest break of all, a phone call from the real Rudy Rios when we come back.

How does a seemingly normal, fun-loving boy raised in a beautiful home by caring parents turn into a murderer who would ambush his own family and even take a bullet in the arm to make himself look like a victim?

How does a seemingly normal, fun-loving boy raised in a beautiful home by caring parents turn into a murderer who would ambush his own family and even take a bullet in the arm to make himself look like a victim?

A classic sociopath, says psychiatrist Dr. Edward Halliwell of the Halliwell Centers in New York and Boston.

A classic sociopath, says psychiatrist Dr. Edward Halliwell of the Halliwell Centers in New York and Boston.

That observation is confirmed in the confession of getaway driver Steve Champagne.

That observation is confirmed in the confession of getaway driver Steve Champagne.