The Encrypted Massacre Investigation

"Good, this should save alot of explaining, then." L says and stands up, walking to the console, slowly as if afraid he might fall. (for those of you who may be confused at this, Near, the new L, can't walk very well.) He picks up the manilla folder and sits back down, handing it to you. "Go ahead and open it up." You lift the envelope's flap. and pull out a few sheets of paper and some pictures of a guesome murder scene. L points to one of them. The late thirty-year-old man was lying across a sofa, blood stained around a long slash down his back.