Blaine Alexander

Detectives were just a few days into the murder investigation of Dr. Stephen Schwartz when they caught their first big break, a match on some of the fingerprints they'd found at the crime scene.

They belonged to Rebecca's oldest son, 33-year-old Eric Nichols, whose prints were on file because he had previously been arrested for driving with a suspended license.

Eric lived near Portage, Wisconsin, owned a Verizon store there.

He was married with a baby on the way.

including a door to the garage close to Stephen Schwartz's body.

The door appeared to have been forced open.

So the forensic evidence comes back.

That was almost two months before the murder, and Eric said he hadn't been to Florida since.

Did you confront him and say, sir, we have your fingerprints all over this crime scene?

They are.

So he was absolutely in Wisconsin.

Does that kind of take the wind out of your investigative sails?

It does.

It does.

But you just keep plugging away, just following up on leads.

Over the course of those kind of first few days after the doctor's murder ballpark, how many people would you say that you interviewed?

And they talked to Rebecca's other son, 28-year-old Ben Nichols, who lived in Florida near his mom and stepdad.

Ben worked on some of the Schwartz's properties and had a landscaping business.

But Detective Diebel had learned something else about him.

About five years before the murder, he stole his mother's jewelry and Stevens' watches, then pawned them.