Lester Holt

That's correct.

Who would want to murder Autumn Klein?

The spouse is almost always a suspect till they're not.

But the husband here, Bob Ferranti, was a renowned medical researcher.

He didn't seem to fit the bill.

Professional guy.

Well regarded.

There don't seem to be any money issues in the household.

That's true.

In fact, the marriage of Ferrante and Klein appeared to outsiders to be a good one.

Still, detectives had to consider the husband's line of research.

He worked routinely with toxins in his lab, but not with cyanide.

More than a week after they first interviewed the husband, detectives began talking to his lab associates.

The people that we talked to said that there was no research with cyanide.

Yet detectives were just getting started with their investigation.

They combed through labs and laptops, interviewed friends and colleagues, reanalyzed hospital footage.

A picture, he said, that revealed only one person who had the motive and the means to kill Autumn Klein.

Her husband, Bob Ferrante.

Though the evidence was largely circumstantial, three months after Autumn's death, the cops were ready to make an arrest.

At the time, Bob Ferrante was visiting his sister in Florida.