Im Amon Eden and im a detective. Now i have a misson that find a murder in a murder case

Im walking around crime scene, it in a apartment at the Eden district in Halo city, the murder case have been really mess, blood everywhere and the victims now only have a head, no body been found, The killer even challenged the police with the words written in the victim's blood.

-'' Mr(Mrs) Inspector how you think about this? '' im asked you, while looking for a weapon