Up next, the woman is brutally attacked.

But before she dies, the victim provides a clue.

But before she dies, the victim provides a clue, written on the wall as the work ROC rock.

The trail leads investigators to an escort service and a shootout between two rivals.

It's something that you would expect out of a Hollywood movie, not out of real life.

But a tiny clue found in an unlikely place exposes the real killer.

Airline customer service representatives deal with hundreds of complaints each day.

Karen Panell enjoyed working for an airline, but when she learned, she had multiple sclerosis, she wondered how long she could continue.

I think Karen was afraid, and she would be in a situation where she couldn't enjoy life the way she did.

One Saturday morning, Karen's boyfriend, Tim Permanter, became concerned when he couldn't get in touch with her.

He was worried about her because she had MS in early stages and that, you know, she was prone to, she could have blackouts and she wouldn't answer the phone.

So Tim drove to Karen's apartment in Tampa, Florida, to check up on her.

He found the door jar, became more concerned, went in just a few feet to where he saw her

lying on the floor.

What are you on the way?

What's the problem?

I don't know.

I could play here.

She did what?

I'm going here. Is she what? Is she conscious?

Is she breathing?

I don't know.

...