Answer:
The knife, the knife would probably have been touched or attempted to have been pulled out by the eyewitness to either; try and save the victim, or try and help them. The bedroom door would've needed to have been touched too to be able to enter into the room. The drapes were most likely opened by the eyewitness to see better because the lamp was on the floor. The mirror, and tap, were probably touched by the victim or suspect but most likely not by the eyewitness leaving the glass cup, the eyewitness was probably bringing that to the victim when they saw their body.
