I just joined Websleuths, so I don't know how much of this has already been mentioned. But I thought I might share my thoughts on this case, as someone who lives in Bloomington, is interested in investigation, and has been recently reading and thinking about this case.
When thinking about this case, I take as my starting point, a witness uncovered by blogger Tony Gatto. The witness was a manager at a local bar, who told Gatto, and the police, that she saw a woman matching Spierer's description, get stopped by a man as the woman was walking past Tenth & College Apartments. (The facade of these apartments is directly on the route Spierer would have been traveling, if walking from her allegedly last known indoor location (5North Townhomes) to her place of residence (Smallwood).)
The witness states that the woman matching Spierer's description was lifted by the man, flung over his shoulder, and carried away. As I recall, there is a big digital clock attached to that apartment building, which would explain how the witness could be insistent, that she saw this occur at exactly 3:38.
My next entry point, into constructing a theory about this case, concerns the identity of the young man who punched Corey Rossman. Private investigators hired by the Spierer family identify who the puncher was, as reported by the Journal News. Since, as far as I know, the puncher was not publicly identified as a person of interest by the police, I'll refer to him only by his initials: ZO. According to rumors, ZO, at least at the time of Lauren's disappearance, was a major cocaine dealer on IU campus.
As those familiar with the timeline are aware, Rossman and Spierer, coming from Kilroy's Sport's Bar, arrived at Smallwood Apartments at 2:30 am and were there for about ten minutes, during which time Rossman was punched by someone (ZO), on the fifth floor. Rossman, at that point, according to him, lost his memory, not to regain it again for the rest of the night.
The pair then traveled through an alley, to Rossman's place at 5North Townhomes (two blocks away), presumably arriving there around 3 am. (Along the way, they stopped into Tenth & College Apartments, to look for some girls that apparently weren't home.) According to Jason Rosenbaum (Rossman's neighbor at 5N, who also knew Spierer) Spierer moved from Rossman's apartment to his, after Mike Beth, supposedly, put a blacked-out and vomiting Corey Rossman to bed. Rosenbaum, famously claims that Spierer then left his apartment, at 4:30 am, him watching from his balcony, as she walked down to College Ave, and turned right, headed toward Smallwood.
The last crucial piece of the puzzle, for my theory, is the phone calls. There is a 3:30 call from Beth to Rosenbaum. Then there are two calls, between 4 am and 4:30, from Rosenbaum's phone to Rohn (an acquaintance of Spierer's from Smallwood) and to a second unknown person.
So here's one way, it seems to me, to fit all of this together (hypothetically and theoretically speaking): Rossman and Spierer arrive at 5North at 3 am. Beth takes 30 minutes to wrangle his drunk, vomiting roommate (Rossman) into bed. During this time, Spierer gets tired of waiting and wanders away, heading back down College Ave. This would take her right past Tenth & College Apts. at just the right time for the bar manager to see her, at 3:38. Then the mystery man picks her up and disappears with her, let's say into Tenth & College.
Now, this is interesting: according to my investigation, ZO, at that time, was living in an apartment on the 3rd floor of Tenth & College Apts! According to Gatto, the witness described the mystery man as, "dark-skinned, about 5 feet, nine inches, 160 pounds, defined facial bone-structure and pointed, thin, rounded sideburns. ...wearing a polo-style shirt". This does not fit with a description of ZO. However, also according to my investigation, ZO had a roommate at the time, initials AB, that arguably does fit this description.
So, again speaking hypothetically and theoretically, let's say that Mike Beth finishes putting Rossman to bed, and comes out to find that Spierer has vanished. Let us further suppose that Rosenbaum, AB, and others are at a party at ZO's apartment, without ZO actually being present for all of it. This would explain Beth's call to Rosenbaum at 3:30: he calls and says something like, "Hey Lauren just wandered out of my apartment. She must be headed to Smallwood. She's barely mobile. Would someday check and see if she's walking past Tenth & College right now, and if she's okay?"
So, at this point, say somebody goes out the back to look, and AB goes out the College Ave. side of the building, just in time to find Lauren, and be witnessed by the bar manager, picking her up and carrying her into Tenth & College. According to this theory then, she dies in ZO and AB's apartment, sometime between 3:38 and around 4 am, Friday, June 3rd, due to some combination of drugs, alcohol, her heart problem, falling down and striking her head, or maybe something more sinister. Rosenbaum is still at the party when this happens, let's suppose. This then would explain the two calls from Rosenbaum's phone at that time. He's calling people at Smallwood, perhaps looking for ZO, to figure out what to do about Spierer being dead in the apartment. Perhaps, because of drugs or some other illegal activity, they can't call the hospital or the police.
Somehow, they get rid of the body, with such skill, that even the massive professional search done for her couldn't find the body. Then the boys involved come up with a story: we have to move the time and location of her death, they reason, so as to throw off the investigation. So, they have her not leaving 5North until 4:30, and don't mention her or them being at Tenth & College at all.
There are problems with this theory: I went to 10th and College apartments, and noticed a lot of cameras. So, presumably, AB would have been captured on camera, taking Spierer up to the 3rd floor, at 3:38. Is it possible the police missed this, because they believed she was at 5North during that time? Also, the theory doesn't explain how her body was disposed of.
So, I suppose the way to test this theory would be to look for footage of Lauren being taken up to the 3rd floor of Tenth and College, at about ten till four. Then presumably, they'd have to get her body back out between four and five. When I was poking around Tenth & College, I wasn't able to get on a floor (that requires a pass card). But I noticed that the floors seem to have elevator access that goes right to the parking garage. So, according to this theory, one would imagine that they'd have to get her body to the elevator somehow, presumably contained in something, due to the cameras. And then they'd presumably be on camera exiting the parking garage is whatever vehicle they might have used.
I admit, one would assume that the police would have already found such surveillance footage, if it existed. I can only think, if this theory is correct, maybe they weren't looking for footage of her inside Tenth & College at that time, or the relevant cameras weren't operating. Anyway, those are my thoughts. May the truth come out soon, whatever it is.