The murders were as inexplicable as they were gruesome: separate killings six days apart in 1984 near Denver that claimed the lives of four people, including a mother and father and their 7-year-old daughter.
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The killings haunted the police officers who responded to the scenes, the authorities would later say, and for decades detectives in the two communities where the murders occurred, Aurora and Lakewood, Colo., pursued leads and developed theories. Some of them retired or died, but the search for answers eluded them — until last month.
On [August 10], officials said that the DNA profile of a man in a Nevada prison on unrelated attempted murder charges matched with evidence found at the Colorado murder scenes.
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An arrest warrant has been issued for the inmate, Alexander C. Ewing, 57, and the authorities will seek to extradite him to Colorado, where he faces murder, sexual assault, burglary and related charges in connection with the four killings.
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The break in the Colorado murders began after Nevada in 2013 mandated the collection of DNA samples from all inmates convicted of felonies.
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It was not immediately clear when Mr. Ewing’s DNA sample was collected, but on July 11, Lakewood detectives were told that the national database had linked his DNA to that found at the murder scenes, court records said.
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