Richard Dale Griffin, 60, of Wimberley, was charged with two second-degree felonies on Monday.
Griffin, owner of Kim-Soo Karate on the outskirts of Wimberley, turned himself in to the Hays County Sheriff's Office on two warrants for possession of child pornography and sexual performance of a child.
"These additional criminal charges stem from a continuing investigation conducted by the Hays County Sheriff's Office in conjunction with the United States Secret Service," a press release from the Sheriff's office said.
Griffin was previously arrested on three accounts of sexual assault of a child in August and posted bail of $450,000. As of Tuesday afternoon, Griffin had posted bail once again, this time for $100,000.
The case is still under investigation.