Officially, 12 of them have never been solved.

He was famously represented by F. Lee Bailey, who later would write a book about the case.

So this film actually has much more in common with a journalistic story than one strictly about the crime.

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Carrie Coon and Keira Knightley in ‘Boston Strangler’Claire Folger

These are nobodies, he told her.

And who do you think our readers are?

A clever touch, here.

Keira Knightley in ‘Boston Strangler’

The Boston Strangler, 1968 20th Century Fox

It begins streaming Friday on Hulu.