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A 38-year-old former Aurora man has been sentenced to 55 years in federal prison after impregnating a girl three times while sexually abusing her for eight years starting when she was 6 years old, according to federal court documents.

Mario Barjas Carbajal – who is associated with at least 16 known aliases – pleaded guilty to crossing a state line to engage in a sexual act with the girl, whose family member also was convicted of obtaining fake identification to hide the girl’s age after she became pregnant, according to documents filed in the U.S. District Court of Northern Illinois. Judge Samuel Der-Yeghiayan handed down both sentences.

Last November, a 40-year-old woman who is related to the girl pleaded guilty to producing a false identification document and was sentenced this March to five years in federal prison, according to court documents. Maria Porcayo Carbajal is now in custody at the Federal Correctional Institution in Florida.

In her plea statement, Porcayo admits to knowing Carbajal had been abusing the girl and to taking no action to stop the sexual abuse.

A complaint filed by an FBI special agent in October 2014 details roughly eight years of abuse and the girl’s repeated attempts to make it stop.

Carbajal impregnated the girl three times, according to the FBI’s investigation.

The abuse started in 2003, when the girl, then 6 years old, moved from Mexico to Chicago, then to Virginia, according to court documents.

The girl first told a counselor and the principal at her elementary school in Virginia about the abuse in 2007. Child Protective Services investigated, but the girl denied the abuse, according to court documents. She later said Carbajal threatened to hurt her and her siblings if she told the truth, according to court documents.

The second time she tried to get help, she wrote a note on the back of a drawing she gave to the school counselor.

The school again contacted Child Protective Services. Again, the girl was afraid to tell the truth, according to court documents.

In December 2008, someone walked into a room where Carbajal was molesting the girl. A few days later, police showed up with a social worker. But yet again, the girl kept quiet.

In January 2009, Carbajal was charged with aggravated sexual battery under the name Marcos Diaz in Virginia, and a warrant was issued for his arrest.

Carbajal subsequently moved the girl and other relatives to Ohio, Aurora and Texas.

In October 2009, Carbajal and Porcayo found out the girl was pregnant. They obtained a fake Mexican consulate card with a birth date that would have made her 20 years old at the time. Using the fake ID, the girl applied for medical insurance and received prenatal care, according to court records.

When she was 12, her first child was born, according to court documents. Half a year later, Carbajal got her pregnant again. In December 2010, when she refused to have sex with him, he punched her in the stomach, and she miscarried, according to court records.

In mid-2011, when the girl was 13, Carbajal got her pregnant again, according to the documents. In 2012, the girl, then 14, gave birth to her second child.

A few months later, she moved to New York to live with a man she met online. She had told him she was in her 20s. In 2014, she gave birth to his child, her third.

After having that baby, the girl told its father her true age and history of sexual abuse, according to court documents. The man reported the information to New York police, which referred the case to the state’s child protective services. The girl and her children were placed in foster care.

Through recorded phone calls, the FBI captured Carbajal discussing his explicit relationship with the girl, calling her “baby,” saying he loved her, and referencing their children.

“How are my kids?” Carbajal asked, according to the complaint.

Upon release from prison, Carbajal will be surrendered to a Homeland Security official for a determination on the issue of his possible deportation, according to court documents. If he is not deported, Carbajal must be on supervised release for five years. For Porcayo, the situation is similar, but her supervised release is to last three years.

Although Porcayo quickly appealed her sentence, in November the 7th Circuit Court of Appeals affirmed the original court’s judgment. Porcayo’s attorney, Bart E. Beals, said he is now working on taking the case to the U.S. Supreme Court.

“I do not believe my client’s sentence was fair,” Beals said. “She was a victim of Mario Carbajal’s intimidation, financial and mental abuse. She should have been given a much lower sentence.”

Carbajal’s attorney did not return a message seeking comment.

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Twitter @hannahmleone