Tiffany McInnis

So investigators ruled him out.

We also looked into a former boss of Kim's named Frank McCormick.

That boss who had sent Kim all those disturbing love letters and images.

You have to ask yourself, how far was he willing to go to get her attention?

Because obsession can lead to something dangerous.

Absolutely.

Frank McCormick declined an interview with 48 Hours, but he did speak to investigators.

Detective Wilson confronted him with a stack of those letters.

It's bringing back some memories for you.

Regardless of what he said he remembered, McCormick still had that alibi, documented by the grocery store receipt from around the time Kim disappeared.

So, ultimately, we felt like Frank was not relevant to this case.

Who became your top suspects in the disappearance of Kim?

Our top suspect was Terry Rose.

He's showing all the typical behaviors of someone who is abusive.

He just couldn't let go.

But when approached more than two decades later, Terry Rose, now 66 years old, was still adamant he had nothing to do with Kim Langwell's disappearance.

What's your theory on what happened to her?

And so we're trying to find his inner circle.

So we wanted to find these people that were close to Terry.

One of those people was David Wiley, who Terry Rose played pool with the night Kim went missing.