If this crime happened today, there would be dozens of doorbell cams and business cams tracing that car from start to finish! There would be apartment complex surveillance cameras, work cameras, car gps, cell phone data, and more to piece together, as well. Yes, these things existed then, but not on the level they do now both in terms of quantity and quality. Even the absence of information from certain devices at key times is incriminating nowadays. Hoping the perp slips up, somehow, or karma brutally strikes!
My biggest fear is that he (the guy who's been the main suspect all along, imo) won't get caught, ever, because anything that was there to be discovered is long gone by now. There's no body that's hidden somewhere, no invite or meetup the day of, and no incriminating text msgs, IMs, or emails. I don't see this guy confessing or telling anyone what he did, either. If there's no DNA on Allie, no surveillance footage, and no way to contest his suspicious alibi by now, what could possibly trip him up?