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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." 

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. 

"Hamilton’s death was determined by the Office of the Chief Medical Examiner to be a homicide by strangulation. Detectives learned from Hamilton’s family that she was autistic and had recently moved to Aberdeen with her twenty-two-year-old boyfriend," the Aberdeen Police Department wrote in a press release Thursday. 

BORDER PATROL AGENTS ARREST DOZENS OF ILLEGAL IMMIGRANT CRIMINALS, GANG MEMBERS

MS-13 gang member tattoo Maryland

Armed police from Maryland's Prince George's County Anti-Gang Unit question and detain a confirmed gang member of Mara Salvatrucha 13, or MS-13, April 20, 2006 in Langley Park, Maryland. The confirmed MS-13 gang member's tattoos were photographed for the police data base. (Robert Nickelsberg/Getty Images)

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. 

He was arrested last Sunday in Edgewood, which is about 10 miles south of Aberdeen. He is being held without bail at the Harford County Detention Center.

ICE ARRESTS ILLEGAL IMMIGRANT WITH CHILD SEX CRIME CONVICTION, MULTIPLE DEPORTATIONS

Kayla Hamilton of Md

Police handout of Kayla Hamilton.  (Aberdeen Police Dept. )

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

"I'm her mother, I'm supposed to be there to protect her, but you can't protect your kids when they're adults," Nobles added, according to CBS. "But, I just feel responsible. I was supposed to keep her safe."

HONDURAN MS-13 GANG MEMBER WITH PRIOR DEPORTATIONS SENTENCED FOR DRUG, GUN CRIMES

Aberdeen Lt. C. William Reiber said that local police worked continuously to track down the suspect and bring closure to the family. 

Maryland police dept

The Aberdeen, Maryland, police department.  (Google Maps)

"This was about making that arrest for Kayla, and so she just wasn't a number. That this meant something," Reiber said, CBS reported. "It meant something to be a part of it, I can tell you it meant a lot to me and our team here in Aberdeen."

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The Department of Justice described MS-13 as "one of the largest street gangs in the United States" back in April, which operates in areas such as Frederick County, Anne Arundel County, Prince George’s County, and Montgomery County in Maryland.