Maureen Maher

So only the killer could have known.

Yes.

And I was, like, chilled that, oh, my God, he did do it.

Vera was arrested the next day without incident outside his family's house, and a search warrant was issued for his padlocked bedroom.

It was a stolen .357 Magnum, which Tess concluded was the murder weapon.

That's not all they found.

Biro had handcuffs similar to those found on Richard and a scrapbook of articles on the killings.

But Biro told police he was only holding the gun for a friend.

Did you question Biro?

David Biro was charged with two counts of first-degree murder, intentional homicide of an unborn child,

burglary, and home invasion.

He pled not guilty.

You have this horrible crime, and the idea is that it's someone coming from the outside.

no one was more surprised than the Bishop family.

I was shocked.

I was absolutely shocked that a 16-year-old boy could have put a .357 Magnum revolver to the back of a grown man's head and pulled the trigger.

Even more shocking, David Biro was the son of a family friend.

I know the Biros.

David Biro's father worked for my husband at one point.

I thought, well, that's a mistake, I'm sure.