Alexander N. Louis, 27, of North Chicago.

A judge set bond at $50,000 on Wednesday for the U.S. Marine Corps recruiter charged with sexual assault of a teenage recruit from Lake Villa.

Alexander N. Louis, 27, of the 1800 block of Georgia Avenue in North Chicago, was arrested on Tuesday and charged with criminal sexual assault, a Class 1 felony.

Lake County Sheriff Sgt. Christopher Covelli said that detectives began investigating on Friday. They learned that Louis, who has been assigned to the Marine Corps Recruiting Center in Waukegan since 2016, drove to the teenage victim’s home near Lake Villa on several occasions while her parents were not home, Covelli said.

“During one of those occasions he engaged in an act of sexual penetration with the juvenile,” Covelli said.

Officials said that the victim was working to enlist in the Marine Corps. “As Louis held a position of trust, authority, and supervision over the juvenile, he was subsequently arrested,” Covelli said.

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The Lake County Sheriff’s Office said that the United States Marine Corps has been “fully cooperative during this investigation” and sheriff’s detectives have been working with the Naval Criminal Investigative Service.

Investigators are still working to determine if there are any other victims.

Louis was appointed a public defender and appeared in bond court on Wednesday where a judge set his bond at $50,000, meaning he would need to post $5,000 to be released from jail.

He remains held in the Lake County Jail and is scheduled to appear in court again on Friday.