It's been 7,680 days since my sister disappeared,

and I've been waiting for answers on what happened to her.

This is one of those cases that has haunted me my entire career.

I was there from day one.

This could be a very significant break in this case.

June 27, 2000, I was a reporter at WBZ TV in Boston.

We received word that there was a teenager missing

in Warren, Massachusetts. It was a lifeguard who was supposed to be working at this pond.

Do you remember coming here?

Yes.

It started like every other missing person case that I've ever worked.

And about what time did Molly arrive here?

We believe sometime after 9.50.

Molly went to work that day,

which her eighth day as a lifeguard at Cummins Pond.

She drove with her mom to work.

She stopped at an extramart and purchased a bottle of water. She went to the police station, secured a police radio.

Her mom, and she then drove the short distance down to Cummins Pond.

I was with Molly and I dropped her off and everything seemed fine.

And the rest is a mystery at this point.

And what was left behind mystery at this point.

And what was left behind? Chair, radio, her flip flops, a bottle of water.

...