LUBBOCK, Texas (AP) _ A man was sentenced Wednesday to 15 years in prison for sexually assaulting his severely retarded sister-in-law, who became pregnant.

Jimmy Wayne Wooten, 42, pleaded no contest April 23 to raping his wife's sister, who has the IQ of a 2-year-old, cannot speak and needs assistance going to the bathroom.

The 34-year-old woman gave birth to a son Jan. 1, 1991. She is so severely impaired she never realized she was carrying a child.

Her attorney alleged an employee of the Lubbock State School, where the woman lived, must have committed the rape. But DNA blood tests on Wooten and 10 state school employees linked him to the crime.

The case prompted changes in the reporting of abuse of clients in state schools.

The child is in the custody of Wooten's wife. Attorneys for both sides said his future was up to the Texas Department of Human Services.