Rochester, MN (KROC-AM News) - One of the four men charged in connection with a sex-trafficking sting investigation conducted by the Rochester Police Department has pleaded guilty.

Rochester Man Pleads Guilty in Sex Sting Investigation

Olmsted County court records indicate that 44-year-old Brian Charles Tackmann of Rochester has admitted to a felony prostitution charge involving a person reasonably believed to be under the age of 18. He is scheduled to be sentenced in August.

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Details of the Rochester Police Undercover Operation

According to the criminal complaint, police investigators posted online ads featuring a female offering sexual acts or services in exchange for money. The ads were placed on websites known to be used by people seeking to purchase sex and instructed interested individuals to message a phone number. The posts also listed specific prices and indicated the customer would have to report to a specific location in Rochester for the transaction.

TJ Leverentz. TSM Rochester
TJ Leverentz. TSM Rochester
TJ Leverentz. TSM Rochester

The court document says the sting investigation involved an undercover "chatter" who messaged individuals responding to the ads while detectives worked to identify the suspects. The charges allege that Tackmann and the three other men charged in the case were told by the "chatter" that she was a teenager under the age of 18.

READ MORE: 4 Men Charged in Rochester Sex-Trafficking Sting Operation
Three Other Defendants Still Face Charges

All four men were arrested after they arrived at the arranged meeting place in Rochester. The criminal cases against the three other suspects — 43-year-old Richard Mayweathers and 63-year-old Dondi Ray Hanson, both of Rochester, along with 27-year-old Arun Kumar Manimozhian of St. Paul — are still pending.

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