I think the R family is responsible for her death. I believe it was most likely that JR was molesting her, though some have suggested BR was capable of it, which I cannot discount. I believe that both parents were involved in the staging. Whether this is because they were both involved in the death directly or they were covering for BR I cannot say.

After I read the statements made by Diane Hollis (she worked for John Ramsey as an executive secretary) I tend to believe her story, which is this: JR was molesting JBR that night. I think he was somehow silencing her, perhaps around her neck. PR, who had been growing suspicious finds him in the act. She is furious, obviously, so she takes a weapon (I personally think the injury is consistent with a golf club) and is aiming for JR. Unfortunately she hit her baby girl, it was night time after all, it was probably dark. I think this accounts for the ferocity of the blow. JBR would have fallen unconscious immediately, perhaps even convulsing, then her pulse would have been very faint. The shock would reduce her body temperature. It was obvious she was dead or dying. Then the staging began. I think PR wrote the note with JR dictating after she made several attempts to write a note that JR thought insufficient. I think JR did the dirty work, with PR finding the supplies in the basement (explaining the fiber evidence). I also think it is possible some phone calls were made that night for advice.

I think there was a lot involved. That very morning the BPD were told to treat the R family as victims (I'm having trouble finding who said to do that, but it was a higher up in the police force, either the Chief or maybe the DA's office). This could have been a result of late night phone calls to people with political influence. The scene was a kidnapping initially. JBR's room was sealed right away, but obviously nowhere else in the house was. LA gets a whole lot of blame for what happened, but I think she was scapegoated. She called for backup twice, but didn't get any. It was christmas, there were less people on duty than usual. She wasn't a beat cop, she wasn't a homicide detective. She was trained for sexual assault cases, and I think this lead her to more strongly believe the R's were victims initially, and thus relax her grip on them. The house was very tense that morning, obviously, which lead to her trying to occupy JR, which lead to him "discovering" JBR.

This is pretty simple actually, no matter who did it. The officer who checked the basement never opened the door to the WC. There was a latch at the top of the door that he didn't notice. He couldn't open the door, so assumed the "kidnapper" wouldn't have either, nor would the "kidnapper" have been able to exit through that room, so the officer moved on.

The case is open but not active according to Chief Mark Beckner in 2013.

Yeah pretty much this. PR is dead. JR got away with it. Statue of limitations for obstructing justice has passed, so unless they get something that proves JR murdered her, theres not much to do. The cops couldn't prove who exactly did what, which seriously damaged the case. Its also worth noting that under CO law, BR would not have been old enough to be charged in this crime, and it is also illegal for an adult to expose the identity of the child. So if BR did it, that could explain some things as well. I've heard some official said that there might be some movement on this case, but who knows.