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Dark Angel on Masterpiece

Preview | 30s

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Joanne Froggatt, who stole the hearts of millions of viewers as Anna on “Downton Abbey,” stars in a totally different role in this spine-tingling drama – the notorious Victorian poisoner Mary Ann Cotton, Britain’s first female serial killer.

Aired: 05/21/17 | Expired: 05/25/17 | Rating: NR

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