I too am puzzled at the lack of an arrest.
The killer either got very lucky or was very methodical in planning, as one would think an arrest would follow based on fingerprints, DNA, hair and fiber or the like.
While I suppose the cops investigating it could be incompetent, I prefer not to think so; rather, I suspect a lack of evidence to date.
Once you charge a person with murder, the accused has a constitutional right to a speedy trial, and if the evidence is weak, the defense attorney will probably not waive it.
Why arrest someone only to have them walk due to lack of evidence?
Keep digging, keep investigating til they get it right, then arrest.
And if for whatever reason insufficient evidence is found, well, where do you think the expression "got away with murder" originated?
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