Maureen Maher

A hospital assessment written just after Biro left read, at the time of his leaving the hospital, we believed that he was dangerous to himself or to others.

His parents didn't agree.

I hold them partially responsible.

They knew he was dangerous, and they let him walk around unsupervised with a padlock on his bedroom door.

Behind that padlock, a gun.

He sought thrills.

They gave him a rush.

Now three years later and awaiting his murder trial, Birol's behavior remained arrogant and cocky.

In the fall of 1991, Biro went to trial with prosecutors using that perfect crime motive.

Their case was strong.

They had Biro's confession to his good friend and all that evidence found in his bedroom, including the murder weapon.

It was one of the most sensational murder cases in recent history.

As the trial begins, many questions remain about the murders.

But in a surprise move, Biro would take the stand.

He's accused of two murders, but he's taking the witness stand in his own defense.

18-year-old David Biro is speaking out in public for the first time.

Biro stuck to his original story, that he was just holding the gun for another student who had actually committed the murders.

Prosecutors and investigators dismissed the claim outright.

When I looked at him in the courtroom, what I saw was a brash, cocky young man who pretty much believed he was going to outsmart all of us.

Did you ever have any doubt that it was anyone other than David Biro who killed Nancy and Richard?