HOUSTON (AP) — Police have arrested a renowned opera singer and University of Michigan professor on allegations that he and his husband in 2010 sexually assaulted a singer in Houston.

Countertenor David Daniels and his spouse William A. Scott Walters were arrested Tuesday in Ann Arbor, Michigan, on Texas warrants charging each of them with sexual assault of an adult. A Houston police spokesman declined to comment on the charges Wednesday.

Samuel Schultz told The Associated Press on Wednesday that the couple assaulted him when he was living in Houston as a graduate student at Rice University.

The AP doesn't normally name victims of sexual assault but Schultz offered to publicly identify himself to help others fearful of reporting an assault.

Houston attorney Matt Hennessy says Daniels and Walters "are innocent of any wrongdoing."