Police are investigating a series of murders in which the suspect is leaving little to no physical evidence, such as fingerprints or DNA. They cannot even establish an obvious link between victims. The only real evidence they have are strange pieces of typewritten poetry found tucked into the victims' pockets. Who might the police call on to give valuable insight to help them identify the perpetrator and possible future victims?

Forensic anthropologist
Forensic sociologist
Forensic pathologist
Forensic psychiatrist