I'm writing a story about an FBI agent investigating a wealthy man's apparent suicide. He's asked to look into the death by an old friend, and not as an official investigator, as the death is ruled as a suicide by local police. I would like the FBI agent to be a Sherlock Holmes type, and I need some clues for him to find that make him begin to think that the wealthy man was murdered, rather than killed himself. I'm not really sure how the man commits suicide yet (i.e. hanging, gun shot, etc.) Any thoughts?