The Pulaski County sheriff's office said William Chamlee was arrested about 5 a.m. Sunday at a motel in Wapello, Mo.
Authorities said last month that the 47-year-old Chamlee molested a girl and took photos of her without her knowledge, adding that he was believed to be trying to flee to Mexico to avoid arrest, the Arkansas Democrat-Gazette reported.
Police said the crimes were discovered during a drug investigation.
Chamlee was arrested with his girlfriend, identified as Tracy Green. Police said the two will face charges in Missouri "related to counterfeit ID's" and narcotics.