Conrad Roy III's Father

And so the evidence was taking us to Michelle Carter.

So the Commonwealth's office told detectives to keep digging and find out more about Michelle Carter.

First reaction when you see her picture.

During the investigation, Detective Cudmore went undercover.

At that fundraiser, Homers for Conrad, he secretly took photos of Michelle's every move.

To confirm she was the one who sent those texts, he went one step further.

He videotaped Michelle as he dialed the number he got from Conrad's phone.

You're watching her?

Answering the phone?

That's a good sign.

A few months later, as the investigation continued, Detective Gordon decided to pay Michelle Carter a visit.

He found her after school and approached her.

Michelle, the reason why we came out here is because we were looking into Conrad's unfortunate passing.

And she has no idea.

She's been watched.

She has no idea.

Did she look surprised?

A little bit, but at that point, I don't think she understood really what we had and where we were going with it.

At first, Michelle told the detective she tried to talk Conrad out of suicide.

Then the detective asked her about having contact with Conrad on the day he died.