I don't see Sherrill opening the door for
anyone other than someone she knew well that night and there were no signs of a forced entry. IMO, everything happened after Stacy and Suzie returned home. They were inside the house long enough to remove makeup, jewelry, and change into sleep clothes (both Suzie and Stacy's clothes that they wore to the parties was found in Suzie's room), and that isn't something that takes a few seconds to do.
The girls coming in and interrupting something has never made sense because if you look at the layout of the house, Suzie's bedroom was in the back while Sherrill's bedroom and the living room were in the front of the house.
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Super grateful for this little map. I don't think the way the book's found necessarily indicated Sherrill was "interrupted." She possibly just put it down that way and went to sleep, but jmo.
How'd he get in? Ideas, all speculation:
-Sherrill didn't open just window/s in one room, (SPECULATION) there were other open windows in that house because of the varnish, that's an in for him; don't think he'd have attempted coming thru window where someone is visible to him and sleeping, she might be a light sleeper
-Sherrill was expecting someone (100% speculation, and I don't think this is what happened, but it is possible) & this someone is the murderer/abductor
-perp was watching them for a time and Sherrill & Suzie kept a spare key (guessing only), located somewhere on that porch "just in case" someone gets locked out (pure speculation) he may have witnessed someone retrieving that spare emergency key; this situation becomes even more grim if there's a spare somewhere near the carport door
-can't picture him trying doors to see if any of the doors were open, but he might have, and he especially might have tried a door if there's an entry door from the carport/if that was open, he's got another in; he might also have checked the slider in Suzie's room, sliders are vulnerable points and easy to breach; although we know that probably didn't happen (no signs of forced entry), important to note, sliders are also quite often left unlocked
-he had a fake badge, made up a story
-brandished weapon at the door & demanded entry
Most likely, jmo: Probably another open window somewhere throughout the house, but have always suspected carport's involved, would be almost certain based on pics of the home's interior that there's a door leading in from that carport. It's dark, it's shadowy. It's been a busy day, would be extremely concerned somebody left that door unlocked (if it exists, and I'd bet it does). Whether he got in that way or not, would guess the perp made use of the carport, and a gun.