AUSTIN — It usually ends up the other way around.

On Wednesday, Lonnie Kade Welsh, 39, was being held in the Lamb County Jail in West Texas on criminal charges after authorities said he faked a report that he been beaten by staff at a state sex-offender treatment center.

Police said Welsh, an ex-convict who served prison time for four separate sex attacks on girls as young as 6, was being transported to a medical appointment on Nov. 13 when he became belligerent with staff.

He was returned to a secure room at the Texas Civil Commitment Office's treatment center in Littlefield, northwest of Lubbock, and began hitting himself in the face with his clenched fists.

He then claimed staff members at the center had beaten him, but video at the center refuted his story, said Marsha McLane, executive director of the Texas Civil Commitment office.

He was arrested Tuesday and booked into jail on charges of fabricating physical evidence and filing a false police report — charges that could land him back in prison.

The Littlefield center, the only one of its type in Texas, houses more than 270 men who have been convicted of multiple sex offenses and have been officially designated as violent sex predators.

Mike Ward covers state government and politics, including the executive branch, criminal justice and ethics issues, in the Houston Chronicle's Austin Bureau. Send him tips at [email protected] and follow him on Twitter @ChronicleMike.