A MARTA police officer has been charged with child molestation and child exploitation, DeKalb police said Thursday.

Willie Clarence Lee Jr., 46, was arrested Jan. 4, two days after a babysitter found "disturbing" text messages and a pornographic image on the phone of a 14-year-old DeKalb girl, police said in a press release.

Investigators believe Lee, who used to date a family member of the girl, has abused the girl during a 5-year period.

The Clayon County Police Department assisted DeKalb in the investigation.

MARTA has placed Lee on administrative leave.

More details were not released.