what is the conclusion of the pigman and why

Mr. Pignati suffers a second heart attack, goes into cardiac failure, and dies. John unravels and screams out that they have murdered him. He tells Lorraine to leave the scene of Mr Pignati's death so that she is not associated with what has happened; if her mother finds out, she will beat Lorraine as a punishment for being involved in a situation that caused someone to have a heart attack. Both John and Lorraine are filled with remorse, and feel that Mr Pignati would have been better off if he had never met them in the first place. They vow to write the story of their friendship with the generous and special Mr Pignati - the Pigman. This is where we join them, and the novel is created.