Most any cop should be able to tell why the verdict was the way it was. With no difinitive cause of death, no conclusive trail of the body from point A to point B, a lapse on the part of the state to conduct certain available DNA tests, the case was charged with Capital Murder which left the jury with only one lesser included offense options in it's deliberations. As a result the prosecutor failed to prove the case to the point of the lesser included offense, let alone to the required level to envoke the death penalty.
If they had gone for the lessor included offense to begin with, the lesser included offenses of negligent homicide or negligent manslaughter would probably been the outcome.
The state made some unforgivable errors that were needed in this day of CSI or Cold Cases as weekly TV series. I believe TV has made it nearly impossible to achieve convictions on circumstancial evidence. It was true during the OJ trial and it's more true today.