Additional Investigation

Additional Investigation is the post-indictment chapter of each case, and is considered to be the last chapter of the case.

Premise
In every single case after the killer is arrested, with the exception of the first case, you MUST complete a chapter called Additional Investigation to unlock the next case.

In this chapter, you will check up on some of the characters who were suspected but turned out to be innocent. The tasks range from helping out innocent suspects who are in need of something, get more information about the most suspicious, or even catching post-murder findings (such as drug-dealing).

In some circumstances, there will be innocent suspects who you will have to help by examining an item before investigating a scene. These suspects are Kevin Parker, Luke Harris and Janice Mills. YOU MUST examine an item before you investigate a scene where your help is required.

Sometimes the innocent suspect already has something in mind already and will tell you a list of tasks he/she will need help on, so you only need to investigate, examine, analyze (if necessary), and report back to the innocent suspect. So far Martha Price is the only suspect confirmed to already give you a list of tasks she needs help with.

Only one suspect needs to be spoken to in Case #1, and two suspects will be spoken to in Case #2. Cases #3-#50 will have three suspects whom you need to talk to for the tasks aforementioned. For Case #51, you have to talk to one innocent suspect and one post-indictment individual who didn't show up as a suspect in the main investigation. Completing legs of Additional Investigation will net you different rewards.

To see a full list of the rewards, go to Additional Investigation - Rewards.

Unlock Conditions

 * All cases require mastery stars to unlock the Additional Investigation with the exception of the following cases: The Kiss of Death, Innocence Lost, A Deadly Game, The Secret Experiments, The Lake's Bride, The Haunting of Elm Manor, No Smoke Without Fire, The Wollcrafts' Creature, Murder on Campus, Killing Me Softly, At the End of the Rope, The Devil's Playground, The Reaper and the Geek, Spring Break Massacre, Marked for Death, An Elementary Murder, The Rorschach Reaper, Blood and Glory, Troubled Waters, The Scent of Death, A Shot of Beauty, Drive, Swing, Die, One Wedding and a Funeral, Good Girls Don't Die, All the King's Horses, Snakes on the Stage, and It All Ends Here.

Trivia

 * Starting in Corpse in a Garden, there will always be one Additional Investigation leg that gets you a burger for completion of that leg. In addition, you will have one leg that rewards you with free clothes starting in The Grim Butcher.
 * Ginger, Rachel Priest, Margaret Littlewood, Gertrude Piccadilly, James Savage, Irma Anderson, Lola Vallez, and Serena Johnson are the only suspects who give you the same reward (burger) in two of their appearances in the Additional Investigation.
 * Victor Wollcraft is the only suspect who will give you 3 burgers in the Additional Investigation.
 * Chad Baker is the only suspect who will give you free clothes in all of his appeareances in the Additional Investigation.
 * Caroline Fitzgerald, Martha Price, Adam Bentley and Howard Johnson are the only suspects who will give you 18,000 coins in two of their appearances in the Additional Investigation.
 * Howard Johnson is the only suspect who will give you 2 different rewards (coins and clothes) in one case.
 * Kevin Parker, Luke Harris and Janice Mills are the only suspects whom you help by examining an item before investigating a scene in the Additional Investigation.
 * James Savage and Howard Johnson are the only suspects who reward you with different rewards (XP or coins, clothes, and burger) through their appearances in the Additional Investigation.
 * Cathy King and David Jones are the only characters in the game who appear in the Additional Investigation of a case in which they didn't appear as suspects.
 * Cathy King is the only suspect to appear in the Additional Investigation of two cases twice respectively in which she didn't appear as a suspect in.
 * Maple Heights is the only district in which all cases require no stars to proceed to the Additional Investigation.