Question: Who starred in a 1956 American psychological horror-thriller film directed by Mervyn LeRoy and was first became known for her role as schoolteacher Rosemary Sydney?
Sentence (from "The Bad Seed (1956 film)"): The Bad Seed is a 1956 American psychological horror-thriller film with elements of melodrama and film noir, directed by Mervyn LeRoy and starring Nancy Kelly, Patty McCormack, Henry Jones, and Eileen Heckart.
Relevant evidence: Yes