ST. LOUIS, MO (KTVI-FOX2now.com) - A former police officer admits he robbed and sexually assaulted women while on patrol. One of the victims talked to FOX Files investigator Chris Hayes. Leon Pullen pleaded guilty to his scheme in robbing and sexually assaulting escorts, including the woman we talked to, who wants to protect her identity.

The anonymous escort told us, "I took a big sigh of relief after he said, 'I did it. I did all those things.' I just kind of relaxed. It was like closure."

She was in town for last year's All-Star Game. She was "working" on the side. She advertised $400 - $500 an hour escort services in "Backpages." That's where former officer Pullen found her and the FBI said Pullen had help in the conspiracy to rob and assault her at the police station.

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The anonymous escort said, "The first officer walked in and said the coast is clear. You can bring her in now."

The FBI reported that Leon Pullen lured many women like her to the small department where he worked -- Uplands Park -- a small village off Natural Bridge Road near the University of Missouri St. Louis.

She said Pullen took her to the Uplands Park jail and put her in a room not much bigger than a closet. He admitted to robbing her and sexually assaulting her, then telling his partner to lie about it because no one would believe her if she reported it.

The anonymous escort said, "That really hurt because no matter what people decide to do with their lives you can't just downplay someone because they do this, they're a reporter, they're an escort. You can't just categorize people and say nobody's going to believe those girls."

She added, "The [FBI] had fingerprints from everything gone through in my purse in the car. They also had DNA collected evidence."

She said the FBI also traced her cell phone movement to confirm that she was where she said she was -- in the Uplands Park Police station and in the Village of Uplands Park.

Pullen's former partner turned state witness, then got a job at a nearby police department until we confronted him about his reported involvement in the extortion part of the crime. Justin Biancardi's yet to be charged with anything, even though he's named as a co-conspirator in Pullen's case.

Leon Pullen will hear how many years he'll serve in federal prison in October. A judge will give him anywhere between 18 and a half to 25 years.