Lester Holt

Maybe Autumn wandered into one of those.

Detectives pulled hospital security cam footage from that last day, and here's what they saw.

That's Autumn as she's getting ready to leave work.

She goes up a set of escalators, disappears for roughly six minutes, before coming back down and heading home.

Question.

In those minutes missing from the camera's eye, had she found her way into a lab with toxins?

And maybe this is where she goes to get her hands on cyanide to inexplicably kill herself.

That's correct.

Yet there was a problem with that scenario, a big one.

The investigators learned that to get into any of those labs, Autumn would have needed a special access card.

Is there any sign that she had a card swipe that put her in an area where another researcher or somebody might have had cyanide?

No.

There's no card swipes at the time that she left work.

The more they dug, the less detectives believed this unexpected death was a suicide.

True, Autumn was frustrated by her infertility, but disappointment was all it was, thinks her cousin Sharon.

Suicide was never on her radar.

Family, friends, and colleagues agreed.

Autumn was a woman with plans to live, not die.

She had a daughter she adored and was scheduling vacations and new research projects just before her death.

So if she didn't take it, and your theory is that she hasn't killed herself, the only place to go is homicide.