The May Killer

Hey guys, emma here!!

Does anyone know anything about the "may killer" by any chance? I was on a walk and i found this piece of like.... a newspaper??? It had something about a may killer but i've never heard of anything like that. Anyone know anything? No pressure, obviously, but i'm honestly super curious now LMFAO

Also what category do i put this in there's no "i wanna know wtf this is" category...