Which characters die in To Kill a Mockingbird?

The main characters who die are Tom Robinson, Mrs. Dubose, and Bob Ewell.  Tom's death is the symbolic killing of a mockingbird. Tom is innocent, but is convicted due to the prejudice of people.  It is on his way to jail, that, out of desperation, Tom breaks free and tries to run, then is shot.  Mrs. Dubose's death symbolizes the strength of will and persistence it takes to fight even when one knows he will lose anyway - just like Atticus knew he'd lose his case and Tom would get convicted by the jury in Maycomb.  Bob Ewell's death is further proof of the type of desperate, despicable person that he is.  He was killed trying to harm Scout and Jem.  This is where Boo saves the children's lives by killing Ewell which, again, helps to emphasize the idea that mockingirds (Boo, in this case) do no harm, they only "sing their hearts out for us".