The fire investigator begins by responding to the fire while firefighters are still on the scene. Upon arrival, the investigator photographs the scene and the crowd of spectators. The investigator then interviews the fire chief, taking particular note of any unusual circumstances observed by the firefighters. The investigators records the color and density of the flames, fire patterns, and weather conditions. After the fire is extinguished, the investigator proceeds into the structure, noting the possible point of origin. Witnesses' names, telephone numbers, and addresses are then obtained. The investigator returns to the scene for additional photographs, working from the exterior to the interior of the structure. Based upon evidence and witness information obtained at the scene, the investigator seeks out a suspect. Frequently, an insurance claim will reveal the identity of the arsonist if the motive was to collect insurance proceeds. For the prosecuting attorney, the investigator prepares a fact sheet identifying all witnesses setting forth other pertinent information, and providing a section of supporting documentation (e.g., laboratory findings and photographs). A sample case and six references are provided.