Yeah he had whacked her with a golf club and also had taken to smearing his feces on her belongings, in her bed, on her candy, and on her christmas presents. Fucking gross lol
The duct tape on her mouth had been placed there after she was already dead since there were no tongue prints on it consistent with a struggle. Fibers matching the jacket Patsy wore that night were also found on the inside of the duct tape. This wouldn't have been that contaminated (though it still is), since John ripped the duct tape off and kept it in the wine cellar when he brought JB's body upstairs. He did bring the tape up after though so Patsy's jacket could've had transfer there since she was wearing the same outfit as the night before.
The Boulder PD are a bunch of idiots though. That DNA evidence would never hold up in court, since the examiner used the same finger clipper on each nail, and had also used the same clippers on multiple bodies in the morgue. LMAO So much contamination with all the evidence. It would be a nightmare to try and prosecute the Ramseys. A defense lawyer would've eaten a prosecutor alive.