
Cox was born to a British father and an Irish mother in Vienna. Her parents later divorced. Both of them are pianists, who originally came to Vienna on a grant for musicians. Cox grew up in Vienna and graduated from high school in 2003. She developed an interest in acting after performing in a play as part of her English classes during her final year in high school. After her graduation she went on to study acting at the Max Reinhardt Seminar. In 2008 she was under contract as a stage actor at the Theater in der Josefstadt in Vienna. In 2011 Cox moved to Berlin and since then she has appeared in various movies and series on German and Austrian TV, among them several Tatort movies. Since 2015 she plays the role of the viking woman Brida in the TV series The Last Kingdom, which made her known to international audiences.

Scene of the Crime
TV • 1970

Scene of the Crime
TV • 1970

Scene of the Crime
TV • 1970

Homeland
TV • 2011

Polizeiruf 110
TV • 1971

A Case For Two
TV • 1981

SOKO Leipzig
TV • 2001

SOKO Stuttgart
TV • 2009

SOKO Kitzbühel
TV • 2001

The Last Kingdom
TV • 2015

Vienna Crime Squad
TV • 2005

Wer weiß denn sowas?
TV • 2015

Kommissarin Lucas
TV • 2003

Constellation
TV • 2024

jerks.
TV • 2017

Schnell ermittelt
TV • 2009

Murder Mindfully
TV • 2024

Shades of Guilt
TV • 2015