The case of a 22-year-old man facing charges in connection with a violent sexual assault against a teenage girl in Aurora has been put over.

According to investigators, the girl was sexually assaulted and assaulted while she was walking along a pathway in a wooded area near John West Way and Wellington Road just before noon on June 24.

The man was armed with a handgun at the time and used it to assault the victim, police allege.

Investigators said the victim was able to make her way out of the trail before approaching an employee at nearby Aurora Town Hall asking for help. She was then taken to hospital to be treated for minor physical injuries she sustained in the interaction.

An arrest in the case came after police released a composite sketch and surveillance camera footage of a suspect.

Emilio Gonzalez Ramirez has been charged with aggravated sexual assault, assault with a weapon, pointing a firearm, possession of a weapon, and sexual interference person under 16 in connection with the investigation.

Speaking in court on Tuesday, the lawyer representing Ramirez requested his client undergo a mental health assessment. The order was endorsed by the judge and Ramirez's case was put over.