It wasn't until a few months before her murder that something shifted for him.

The only time I ever actually really talked to her was at a Thanksgiving dinner prior to Thanksgiving before she died.

And it was the first time that I realized that Joan was a pretty cool person, and that we had very similar outlooks on things.

And we had a wonderful conversation.

I really looked forward to talking with her more, like, wow, I got a sister who's pretty cool.

This is great.

I didn't realize that I had that.

Mark has his own opinions of the case and potential suspects based on everything he's learned over the years.