Police in Maryland announced they arrested an illegal immigrant teen and suspected MS-13 gang member for the killing of an autistic 20-year-old woman over the summer.

“It’s been for me, many sleepless nights … I never thought I would take this journey on losing my daughter in such a horrific way and so soon,” Tammy Nobles, the mother of Kayla Hamilton, told WMAR-TV in Baltimore. “When I found out that it was a juvenile, I was shocked. I was like, ‘A juvenile did this to her?’ Like I was really shocked. I could not believe a teenager could do this.”

Kayla Hamilton

Police in Aberdeen, located in northeastern Maryland about 30 miles from Baltimore, announced they arrested an unnamed 17-year-old boy for allegedly strangling 20-year-old Hamilton to death in July.

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Police said U.S. Immigration and Customs Enforcement confirmed the 17-year-old El Salvador native was listed as a member of Malva Salvatrucha, known as MS-13. Authorities were able to nab the suspect after comparing his DNA to evidence from the crime scene.

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In addition to a first degree murder charge, the suspect is facing charges of rape and robbery, according to CBS News.

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