Dallas ? A teenage girl claims in a lawsuit that a former coach at an elite gymnastics academy sexually assaulted her and encouraged her to use cocaine to lose weight.

The lawsuit accuses the World Olympic Gymnastics Academy’s owners – the father of national champion Nastia Liukin and the coach of Olympic gold medalist Carly Patterson – of failing to screen and supervise Christopher Wagoner.

Wagoner, 33, faces trial Sept. 18 in Dallas County on sexual assault charges involving the girl, who was 14 at the time. He has pleaded not guilty. Wagoner does not face any drug-related charges.

The lawsuit does not seek a specific amount of money from owners Valeri Liukin and Yevgeny Marchenko, and does not accuse them of abuse.