A bloodless body, a missing buttstock, a D made of blood...

I'll check his pockets. There's a keyring with a lambda-shaped key and a USB flash drive... A copy of SICP... A wallet with some money... That's all.

Now, while we wait for the rest of the police to arrive, I'd like to interrogate you, >>1-4,6-7. Tell me your whereabouts in the hotel before >>1 discovered the body.