Richard Villanueva, 57, of Waukegan.

A former Waukegan school bus driver arrested in August for sexually assaulting a child is now facing additional charges after prosecutors say a second victim has come forward.

Richard Villanueva, 57, of Waukegan, was charged in late August with four counts of predatory criminal sexual assault of a victim under the age of 13, four counts of criminal sexual assault of a family member and two counts of aggravated criminal sexual abuse of a family member.

A relative of Villanueva, who is now an adult, went to the Waukegan Police Department in August about multiple occasions of sexual assault committed by Villanueva when the victim was a child, according to the Lake County State’s Attorney’s Office.

Investigators questioned Villanueva and were able to secure corroborating statements from him regarding the alleged sexual assaults, the state’s attorney’s office said.

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Prosecutors said that a second victim, a woman in her 30s, came forward after the news media reported on the story in August.

The woman told police that she was sexually abused by Villanueva for several years as a child.

Four additional counts of aggravated criminal sexual abuse were filed on Thursday.

Lake County State’s Attorney Eric Rinehart said his prosecutors are working to “learn the truth about the scope” of Villanueva’s crimes.

“We encourage any additional victims of Mr. Villanueva to come forward to the Waukegan Police Department. Our prosecutors will review the case, and our professional victim advocates will support you,” Rinehart said.

An investigation showed that Villanueva knew both alleged victims.

Prior to his arrest, Villanueva drove a school bus for a company serving the Waukegan School District.

Authorities said both victims were not connected to his occupation but they still encourage parents to speak to their children.

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A Lake County judge set the man’s bond at $750,000. He is scheduled to appear in court on December 9.

Authorities are asking anyone with information on the investigation to contact the Waukegan Police Department Investigations Unit at 847-360-9000.