They do not know who the killer is. They would not "watch and wait" for 3 years for a major homicide of 2 teenage girls, believe me. If they knew who the killer was, he would be under continual surveillance. His phone and internet records would be gone over in detail. They would arrest him for something Friday evening, even if only a traffic violation, and hold him over the weekend, interviewing him with teams of detectives while he was sleep-deprived, to try to force a confession. Since this has not happened, they do not know who the killer is.
unless it is someone that they need to have more evidence against than their usual perp? See the Rebecca Zahau case - obvious perpetrator yet outside the civil case, still "unsolved" - oj Simpson another example? money (notoriety) talks, justice walks...
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