I'm pretty sure I recall he used a key in the door when he opened it and flipped on the light switch on the wall. And when he was leaving alone, they showed the light still on and him pulling the door shut and sort of making sure the door was locked by pulling on the knob.
ETA: after reading my response, I'm starting to think I watch wayyy too many reality crime shows that I noticed that detail (lights, knob, etc). :crazy: Either that, or my ex cop husband has me so trained about paying attention to the smallest details. :sleuth: