ADDENDUM::Prosecutor drops murder charge against Micah Moore in the death of Bethany Deaton | The Kansas City Star

When I initially posted concerning the recantation of Moore's confession back in early November, there was no mention that the charges had been dropped.

“My office concluded that we could not ethically continue to pursue the case given the current evidence against Micah Moore,” Jackson County Prosecutor Jean Peters Baker said Friday in a statement. “The duty of the prosecutor is to seek justice, not merely to convict.”
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Baker went on to say that Deaton’s death remains a great tragedy and that the decision to drop the charge against Moore was reached after consultation with the woman’s family.
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Baker said her office acted properly in filing the charge against Moore after he confessed to suffocating Deaton. She added that prosecutors will keep the case as an open investigation.

I am a bit confused as to why, " prosecutors will keep the case as an open investigation."

Prosecutor drops murder charge against Micah Moore in the death of Bethany Deaton | The Kansas City Star