The purpose of the dagger is never revealed in the game neither it was used for any rampage. According to some myth hunters, this dagger was used in the killing of one of the killer victims and that the killer accidentally dropped the dagger. There are numerous rumors about players hearing chainsaw sounds or pig grunts in the region over the time. However, this has been debunked.
Some myth hunters have theorized that Knife After Dark could, in fact, be based on the Chainsaw Killer's legend.