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Do you remember the last time you spoke with your sister?

I do. She called me Sunday night at 11.30 at a train station in New York.

From Penn station. I could hear the motion from the train station.

So you don't think she knew she was in danger at that time that she called you?

No. From the time that she called me, it was poof, she was gone.

My sister's missing, like this isn't normal.

There was a ping from her phone after she went missing on Long Island.

They knew that there was something very, very wrong here.

The young lady was reported missing Shannon Gilbert.

The missing person's unit had been involved in trying to locate this young lady, find out what happened to her.

We found human remains.

But it seemed to be rap and burlap, which didn't make any sense.

Everyone assumed it was Shannon Gilbert.

But it wasn't, was it? No.

The crime scene gets expanded. I'm called in. The chief, we found another set of remains.

They find another one and another one.

We were dealing with a serial killer.

But they're all 4'11, very petite, hazel, green eyes.

This killer has a type.

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