* The private investigator meticulously examined the evidence, searching for clues to solve the mystery.
* The insurance investigator arrived at the scene of the accident to assess the damage and gather information.
* The police investigator questioned the witnesses in an attempt to piece together what happened.
* The team of investigators worked tirelessly to uncover the truth behind the corporate scandal.
* After a thorough investigation, the investigator concluded that the fire was accidental.