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ARLINGTON (CBSDFW.COM) – Police in Arlington have made an arrest in a double murder case from three years ago. It was June 10, 2012 when officers discovered the bodies of Long Nguyen and Huong Ly at their home, located in the 3600 block of Waverly Drive.

Authorities were sent to the home to check on the welfare of the two residents. But the Tarrant County Medical Examiner said that the victims died as a result of homicide. After conducting several interviews and pursuing tips, the investigation went cold without an arrest being made.

Huong Ly, right, and Long Nguyen were killed in their Arlington apartment on June 10, 2012. (Credit: Arlington PD)

Huong Ly and Long Nguyen were killed in their Arlington apartment on June 10, 2012. (credit: Arlington Police Department)

However, during the crime scene processing, investigators recovered a marijuana cigarette with DNA evidence. That evidence was entered into a larger database. But it was not until this past October that detectives received information about a possible match for a suspect.

“The meticulous crime scene processing that occurred,” said Chief Will Johnson, “highlights how important every little detail is in a significant crime scene, and the role of DNA testing that has afforded us this opportunity to bring much-needed closure to the victim’s family.”

(credit: Arlington Police)

(credit: Arlington Police)

That suspect, Willie Guillory, was located and arrested for a parole violation. Police say he was 16 years old at the time of the double murder. Investigators were able to again match the DNA evidence from the scene with a more recent saliva sample taken from the suspect.

That individual is now behind bars in Tarrant County and charged with capitial murder. His bond has been set at $250,000.

“This is the second case since October that DNA analysis has solved a murder case in our community,” Johnson added.