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Mario Rojas Lara is charged with aggravated sexual assault and forgery. Police say Rojas used false documents to gain employment at the Pflugerville Nursing Home and Rehabilitation Center in April.

According to investigators, the assault happened in September. Lara was fired for an unrelated matter later that month. Police say he worked as a caregiver at the center and that the victim was a patient.

"You take a person who is entrusted to provide medical care for somebody who needs it, who can't provide it for themselves and they abuse that position and that authority,” Officer Jim McLean said. “As a result of that, we had a person sexually assaulted that shouldn't have occurred."

Investigators say the victim wasn't a senior. Police are not sure of Lara's true identity.

Officials are working with the U.S. Department of Homeland Security Immigration and Customs Enforcement to positively identify him.

Authorities say this is the first time a case like this has been reported in Pflugerville.