the raven or the poet, i would kill the person with a knife slash to the throat, then use their own blood to write a famous poem on parchment paper, which i would leave under a dead raven next to their corpse, which would be hanging upside down, with all the excess blood not used to write with dripping into a large urn, the parchment of course made from human skin, though not from that particular victim, but from bodies stolen from crematoriums, i would possibly use a special knife or take videos of my self wearing a raven mask reading the poem next to the dead victim
edit: in addition to all of that i would have some of my favorite classical selections playing on a continuous loop until the investigators turned it off, it would be awesome