Maureen Maher

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.

Every year, the bureaus would send a Christmas card to my family with a picture of them, the parents and the kids.

And I thought, oh my God, I've seen a picture of this killer.

But as information trickled out, Jean learned more about who that kid on the Christmas card had become.

What did you find out or hear about him?

Very disturbing things, that there had been a history of violence, that he had fired out of his window with a BB gun at passersby, that he had lit somebody on fire.

David was going down the road of a sociopath.

True crime writer Jerilyn Kolarik wrote a book about the case and described a deeply disturbed David Biro, who at age 14 tried to poison his family.

His brother and sister are sitting down at the table for lunch and they drink some milk and the milk is tainted.

Somebody put wood alcohol into the milk.

Within hours, Biro's parents checked him into a psychiatric hospital for juveniles.

But after less than two months, they let him come home against doctors' recommendations for continued treatment.

He convinces his father and mother not to let him go back.

And they didn't even bother doing any follow-up psychiatric with him.

That was it.

That's all he ever did.

That's it.

That's it.