Deputies with the Wake County Sheriff's Office arrested Alexander James Cogdell, 35, of Kinston.
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They said Cogdell was wearing an ankle monitor that went off because he was in violation of parole.
Authorities said Cogdell was attending the fair with his family; however, they did not specify where he was arrested.
Cogdell was charged with being a registered sex offender in a place with children on the premises and booked into the Wake County Detention Center.