Previously on Anatomy of Murder.

Antifreeze, ethylene glycol.

It's a horrible way to die.

You don't die instantly by any stretch in imagination.

You die, you know, almost cell by cell.

Not something that, you know, you would think of as using as a methodology of suicide.

I'm in an ambulance of 3127 works a road. I just had to suicide. I had to an ambulance of 41, 27 works a road.

I just had to know.

I had to know, you know, concretely and for certain

what the guy died from.

And what's the problem?

My daughter, I believe, has taken some bills.

Whoever wrote that note killed Mike Wallace and David Castro it couldn't be anybody else

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

I'm Anasiga Nikolaazi, former New York City homicide prosecutor and host of investigation

discoveries true conviction.

And this is Anatomy of murder.

Now, a quick reminder, this is the second episode in a two-part series. So if you haven't yet, go back and listen to part one. On August 22nd, 2005, 37-year-old

Stacy Castor called 911 to report her husband's possible death by suicide.

A medical examiner would later confirm David Castor had died from ingesting a lethal dose

of ethylene glycol, better known as antifreeze.

But investigators from Onondago County, New York, including the DA, Bill Fitzpatrick,

...