Why do people get murdered?

Money, sex, and power is the three big themes.

You're my business partner and you're a problem I eliminate you.

You know, I want to have a new lover and I eliminate my new one

or just money or whatever. We're revenge.

And it was tough because this scene didn't really fall into any of those categories.

I'm Scott Weinberger, investigative journalist and former deputy sheriff.

I'm Anna Sieg and Nicolasi, former New York City homicide prosecutor

and host of investigation discoveries through conviction.

And this is anatomy of murder.

The case we're covering today is solved, but in some aspects it doesn't feel that way.

Because there's still a question that nags at me and that is why the killer did what they did.

We all know that many homicide cases get solved without ever knowing a motive

and as frustrating as that can be for both the families of victims and for members of law enforcement,

today's case seems to take it to another level.

This story starts in Southern California.

It was there that Andra and Brad Sachs met and raised a family.

Andra had spent most of his childhood in the suburbs of Maryland.

After a father retired from the National Security Administration,

he moved his family to San Diego.

And while there, the family had times of real financial hardship

and it affected Andra greatly.

...