Who killed Mary shaw?

Mary Shaw is a fictional character from the 2007 Horror film "Dead Silence." In the story, she is a ventriloquist who seeks revenge on those who wronged her, particularly after being killed by townspeople. The main character, Jamie, uncovers the truth about her death and the curse she imposes, revealing that the townsfolk, believing she was responsible for the death of a child, killed her. Ultimately, Jamie confronts her ghostly presence as he seeks to unravel the mystery surrounding her demise.