SAO PAULO, Brazil - A prosecutor asked a judge Friday to charge Brazilian swimming star Rebeca Gusmao with fraud because her doping tests during last year's Pan American Games had the DNA of another person.

Gusmao has denied wrongdoing but could face at least a year in prison if convicted on the charge of false representation, prosecutor Alexandre Murilo Graca said in a statement.

Gusmao, who tested positive for testosterone just before the July games in Rio de Janeiro, was stripped last month of two gold medals, one silver and one bronze.

Gusmao also was temporarily suspended last month by FINA for testing positive for testosterone in an out-of-competition test on July 13.

The criminal case started after the Brazilian swimming confederation said there was evidence Gusmao's urine samples during the games were altered and asked authorities to launch an investigation. The laboratory that conducted the tests said the samples they received appeared to belong to different donors, according to the swimming confederation.

Gusmao won the women's 50-and 100-metre freestyle races, both in Pan Am Games record times, but the Pan American Sports Organization last month ordered her to return all four of her medals.

The Brazilian swimming confederation said Friday that it received a communique from FINA showing that a second doping test for Gusmao using a different sample also tested positive for testosterone.

She faces a hearing before the FINA doping panel at a date yet to be determined.

Venezuelan swimmer Arlene Semeco, who finished second to Gusmao in the 50 and 100 freestyle races, will get the gold in both events.