Investigators have found a murder victim who was apparently exposed to a toxic substance. In order to find out what the substance was and how it killed the victim, they might look for the help of a 1. forensic geneticist
2. forensic sociologist
3. forensic etymologist
4. forensic chemist

Hi! They might look for the help of a forensic chemist because they study chemistry so they would be able to tell you about the toxic substance and what it can do along with the side effects. A forensic geneticist studies genes, a forensic sociologist studies human behavior, and a forensic etymologist studies origin and history of words. So the most helpful one would be the forensic chemist. i hope this helps, Goodluck :)