Authorities allege that the 47-year-old was part of a ring that kidnapped a 14-year-old girl from San Antonio, forced her to have sex with clients and to dance in a Corpus Christi strip club last year.
The girl escaped one of her alleged captors and waved down a police cruiser, prompting the investigation.
In all, seven people have been charged, including Robertson's girlfriend. All have been arrested except for Robertson, who authorities are still looking for.