Casey, Crime Photographer - The Loaded Dice

Casey's friend Steve Drake calls Casey at 6:00 AM to tell him that he needs help. He says "will you come to my apartment right away? I live at Adeline Gardens, the Barkley House 4A. I think I'm in a bad jam. Hurry over here". Casey says "I'll be there as soon as I can throw some clothes on". A few minutes later, Casey arrives at his apartment. Steve says "thanks for coming over so quickly. I need to show you something". Steve shows Casey a bloody knife on his floor. Steve says "I found this, but I haven't touched it. Earlier, I was asleep and thought I heard my door close so I got up to investigate. My door was unlocked, but I locked it before going to sleep. Someone left the knife here, but I looked around and no one had been stabbed here, and nothing looked out of place."