Dennis Murphy

Six days after the cold-blooded murder of Julie Griffith, family and friends gathered at her church to say goodbye.

Between the visitation and the memorial service, son Zach was overwhelmed.

To close friends Craig and Temple Bradley, Julie's husband Keith was more emotional that day than they'd ever seen him.

Tears.

Sadness.

I'd never seen him cry, you know, in my life.

But even as the Griffith family mourned, Zach and his brother were feeling uneasy about the investigation, which seemed to be focused exclusively on their father.

But Detective Matt Carter had an ongoing investigation, and he felt there was ample reason to pursue their dad.

After his interview with Deanna, he'd driven to the hotel that was Keith's alibi.

There, he uncovered a bombshell.

Remember Keith saying to the detective he'd been at the hotel the entire night, ducking out just twice to get a drink and a snack?

Well, unhappily for Keith's alibi, when the detective hit play on the hotel's security video, it told a vastly different story.

Keith is seen leaving, as he'd claimed, around 11 p.m.

But... I think within 15 to 30 minutes, he's going to be returning.

That never happened.

You're scrolling through the tape?

Going through, going through.

And then where'd your bingo moment come up?

Gone for more than six and a half hours.

Was that enough time for Keith to drive all the way back to his house in Kentucky, commit the crime, and return?