I don't think this will help with anything, and may make matters worse, but that's how I roll some days. I keep reading about all the things someone did differently on the 18th or 19th, changes made, who missed work, etc., etc. Now I'm finding myself thinking, if he's a real jerk, or somewhat experienced at this, maybe even the way many think of psychopaths, why would he bother changing anything? If he normally gets off work by 5 pm, lives alone, doesn't have m/any close friends, drives through Brooklyn regularly (or lives or works there), doesn't have an orderly schedule he lives by and little to no conscience, he could easily grab her (or another girl) after work or in the early evening, do whatever he wants to do, get rid of evidence, go home, get up in the morning and be to work on time the next day. If she did fight back enough to cause any wounds, he'd have plenty of time to come up with an excuse. Of course, if he never socialized, it's possible nobody would even bother asking him about them.
Sorry. I'm not giving up on her, but sometimes these cases can be really frustrating along with all the other things they are. MOO