Lester Holt

He grew even more confident when he reviewed the details of how she had collapsed and suffered.

Cyanide once ingested can quickly starve the body of oxygen.

So oxygen's on the blood, but it's not being utilized by the body.

It was the trapped oxygen that had turned the blood in Autumn's veins that vivid red.

He also considered the 911 call.

As her husband is begging for help, Autumn could be heard moaning in the background.

Lukasiewicz says that was likely Autumn struggling to breathe, another important sign that cyanide was in her system.

He knew he had a bizarre death in his hands and immediately contacted the police.

I called the detectives and I let them know, cause of death is cyanide poisoning.

You need to help me with a manner of death.

He wanted to know if Autumn had taken her own life or been poisoned, in other words, murdered.

Cyanide poisoning?

Yes.

How many of those have you seen in your career?

This is my first one.

Soon, Autumn's mom was given the news about the blood results.

She then called her niece, Sharon King, out in Washington.

Just like that.

When Autumn's colleague, Dr. Karen Roos, heard about it, she knew right away her friend had suffered an agonizing death.

And just as in an old Agatha Christie cozy murder mystery about a cyanide poisoning in the village, the inspector was about to call.