Along these lines, in the Chelsea Bruck case here in Michigan, investigators didn't release the cause of death either but they also weren't constantly warning residents of ongoing danger.
In the end, it turned out, they had recovered DNA and were waiting on a match to turn up. It eventually did. The perp was a 20-something who claimed Bruck died during rough sex and that he got scared and hid her body. The police did not say whether they believe his story, of course, but they didn't seem to think the perp was a serial killer. They seem to have suspected all along they were looking for an individual who may not have a criminal record but who made a series of bad choices under the influence (it occurred after a huge party where substances were rampant), imho.
This may not turn out the same way but it's possible.
Another similarity in Chelsea's case was that LE made comments about the terrible nature of her COD which led locals to speculate all kinds of things from mutilation to gangs of sex traffickers branding the body. But it seems, in retrospect, the officers were just recounting the terrible nature of finding an innocent young person's body abandoned in the wilderness (cause of death was thought to be strangulation or blunt force trauma--possibly accidental).
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