Death is everywhere in The Pigman. Mr. Pignati dies; his wife is dead; Bobo dies; Lorraine's mother tends dying patients; John fears that his father will die soon; John and Lorraine drink above a tomb in the cemetery, where John thinks about the bodies underneath them. Mr. Pignati is so distraught at his wife's death that he cannot even admit that she is dead, but the thought of his own death doesn't seem to bother him. Lorraine doesn't tell us much about how she feels about death, but John has a morbid imagination and tells us several times how the thought of death disturbs him. When Mr. Pignati dies, John and Lorraine's grief forces them to grow up and take responsibility for their actions.
The harsh reality of Mr. Pignati's death forces John and Lorraine to mature and take responsibility for their actions.