A man taking credit for the killings was murdered 50 years ago a serving a prison stint stint for a series of rapes, and questions linger to this day as to whether he was the shrouded figure.
Keira Knightley and co-star Carrie Coon were dressed to the nines on Tuesday at a screening of their film the Boston Strangler at the Museum of Modern Art in New York.
The trailer for the new thriller, which is based on a true story, was released on Tuesday and shows Kiera Knightley is seen taking on the role of journalist Loretta Mclaughlin.