MOO, My own theory, fill in the blanks, poke holes as you wish.
Lauren partied with JR, HT, CR, DR and others and 5 North earlier in the night (perhaps 12:30ish). She went back with CR to Smallwood and was confronted by friends of JW. The beat the snot out of CR because he's with JW's girlfriend. LS & CR leave. Go to Killoys, things are starting to turn worse for Lauren. Perhaps the party favors at 5 North were starting to take on their side effects, mixed with her heart medication or her heart condition. She decides she's going home, or she can't decide anything so CR decides. For reasons unknown to this poster, they leave Smallwood rather quickly. CR shouldn't be there anyway. Maybe she was looking for her phone, maybe she was getting her medicine, maybe we don't know why. HT was likely home at the time (about 2:30). She knows how messed up Lauren was. Now 2:30 is the time that JW says he went to bed. The timing is uncanny. Could it be that HT gave JW a heads up that LS and CR were headed to 5 North? Hmmm. Coincidence? JW leaves his phone so as not to be tracked and goes to find Lauren, who according to HT, made some poor choices that night. She and CR are walking to 5 North via the alley. This was probably a common way to travel. JW beats her to the punch. He's got the heads up that she's on her was there. He's got some business to take care of with the guy that took his girlfriend and his girlfriend herself. JW cuts her off at the gravel lot, under the eye of the camera. He's mad as he**. She is supposed to be with him that night. His real goal is CR, but CR takes off running (he's messed up but not suffering the side effects that LS might be suffering) and is spotted on the video outside of his attorney's office (other reasons he maybe spotted outside attys office), or he runs inside his apartment. Lauren is incapacitated, helpless and at the mercy of a raging mad boyfriend. The side effects of the party favors are really taking effect. Something is happening to LS and between JW and LS - right there at about 3 AM. It doesn't matter anymore. LE and Lauren's parents know. That's all that does matter. There are several questions remaining... Did she die of an overdose? Did JW do something to contribute? Nevertheless, JW is left with LS (I imagine he is culpable or he would have called 911). What is he going to do? Does he have his car nearby? Did he allude the cameras, take the back roads and get to 5 North without being noticed? Did he go on foot afraid his car would be noticed. Does he hide the body in his trunk? a nearby dumpster? The WHERE that we do not know. Still no action on his cell phone, his sleeping alibi is safe. CR eventually gets back to 5 North and tells MB, JR (and the other actors that were present at the pre-party) about his encounter with JW, about Lauren, her condition. They all freak out. They make a few calls but clearer heads prevail. Wait until morning. Perhaps they go out and look for her, perhaps CR is spotted looking for her (the other reason CR may be spotted on video outside his attys office). They're worried because of the condition she is in. They parrtied with her. They contributed. They're culpable. No Lauren.
They all rise early the next morning. Phones are buzzing where is Lauren? But JW? - he takes his roommate to his 8:00 class. Then he starts looking for a place to hide Lauren. It can't be far - his actions are now under the spotlight but there is foot and car traffic and perhaps his car is seen on video at 8:00AM so he fesses up to it anyway. Lauren is missing. He's got very little time. Did he put her in something (suitcase? ) and put her in the trunk before daylight? Did he do it the night before? Could he risk her being found by someone else? He knows where the cameras are. He's been on that campus for 4 years.
Everyone is wondering what happened to Lauren because EVERYONE may have played a part and not even realized it. JW is left holding the bag. He helped, no doubt. Hiding a body is a felony. Drugs are too. Everyone just zips it up tight until a body is found and the cause of death is determined. Perhaps there is more than one cause of death and therefore 10 POIs keep their mouths shut. They all know the part they played, some more than others. But as frat boys go - they all stick together. Some more loyal to friends than others. Some protecting a bigger operation. Some just protecting themselves. Better to be safe. Maybe only one person knows where Lauren is, but 10 are sitting on eggs wondering what their role in a murder conviction may bring.
JR calls DR at 4:15, who ironically lives at Smallwood and was with them earlier, to check and see if Lauren made it home. He doesn't answer. DR is three sheets to the wind.
There's only one common denominator between these people, albeit an innocent one, that is HT. She likes JW but talks to JR that morning. She talks to JW that morning. She knows what everyone said and did, well maybe everything, and Lauren's parents are disgusted that she isn't telling more...
JMOO