investigator
//ɪnˈvɛstɪˌɡeɪtər//
Noun
investigatorSingular
investigatorsPlural
1
A person who carries out a formal inquiry or investigation, especially into a crime, accident, or other matter.
The investigator examined the evidence at the crime scene.
2
A person employed to gather information or evidence, such as a private detective.
She hired a private investigator to find her missing brother.