Gill's response

The night of the murder? Well, I, um, ok, someone forgot a bottle of vodka in my room. I don't drink much, so I figured I'd give it to Merv and Diane. They're always drunk. So, I went over to Merv's room to drop it off. I stayed for a few minutes, then I, uh, went to the physics lab to work on my project. The door on the lab has a digital lock, and I, um, used my card. It would have a record of that. Then, when I came back, I found out what happened to Diane.