Mr. Ballin

The informant would reach out to Cassidy, or Angel, looking to buy some cocaine.

And then once they had clear evidence that she had broken the law by selling these drugs, Sienna would arrest her and then try to strike a deal to get her to talk about Cyril.

And so now, through a pair of binoculars, Sergeant Sienna watched as a small blonde woman appeared at the far end of the alley.

His heartbeat picked up as he realized it was definitely Cassidy, and he watched as she walked right up the alley and began talking to the informant, the man who had been pacing before on his phone.

And when Sienna saw the money and drugs change hands...

he gave the command on his radio to go ahead and move in.

In an instant, two police cars rounded the corner with their sirens blaring, cutting off both ends of the alley.

Cassidy looked completely startled and started to run before the arriving deputies boxed her in.

And moments later, they had her in handcuffs.

The following morning, Sienna stood outside of an interview room at the sheriff's office in Rochester, New York.

He looked through a two-way mirror, and on the other side of the glass, he watched a deputy question Cassidy, the girlfriend of Tabitha's half-brother, Cyril, who was still missing and still a major suspect.

Now, Cassidy had been completely stonewalling police since they'd arrested her for selling cocaine the night before, and she was still insisting that she had no idea where Cyril was or why he disappeared.

Now, to this point, the deputy who was speaking to Cassidy had not brought up Tabitha's murder.

And so at this point, Cassidy seemed to think that her only problem was the cocaine charge.

And so as Sienna watched this interview just kind of go in circles and drag because Cassidy just was not giving them anything,

Finally, Sienna just couldn't take it anymore.

And he just busted in the room and he slammed a folder down right on the table.

Totally shocking, not just the deputy, but Cassidy.

They both looked at him like, what are you doing?

And then before Cassidy could say or do anything, Sienna looked right at her and just said, I don't care about your drug charge.