Erin Moriarty

Sixteen-year-old Molly was Maggie and John Bish's third and youngest child.

48 Hours interviewed John back in 2003.

Molly was an honor roll student, varsity athlete, and she had just completed her junior year of high school.

Molly was just very loud and fun.

Heather says despite their six-year age difference, they were extremely close.

It was a bond she had had with Molly ever since the day she was born.

I do remember thinking that, oh, that baby is my baby, too.

I'm going to teach her everything I know, and we're going to do this life together.

Molly also had a close relationship with her brother.

She very much wanted to be like my brother.

Molly was 5'7".

You know, she was athletic and in shape and strong.

So when police suggested that Molly could have drowned, they didn't believe it.

When Molly went missing, I mean, it was inconceivable.

Adding to the mystery, the police radio was there, but Molly had not used it for her required morning check-in.

Why?

So what was, what happened?

Later that afternoon, when it became clear to local police that Molly had not just walked off with friends.

State police took over the investigation and launched an extensive search.

Massachusetts State Police Lieutenant Colonel Dan Richard headed to Warren to help out.