Dame Harriet Walter is to star in 'Killing Eve'.

Dame Harriet Walter

Dame Harriet Walter

The 68-year-old actress and Danny Sapani are the latest stars to join the cast of the BBC drama series, which has started production on its third series, and 'Fear of the Walking Dead' writer Suzanne Heathcote has also joined the programme as lead writer and executive producer.

Phoebe Waller-Bridge will also executive produce the drama, alongside Suzanne, Sally Woodward Gentle, Lee Morris, Gina Mingacci, Damon Thomas and Sandra Oh, who will reprise her role as the titular star Eve.

Series two ended with a dramatic cliff-hanger as Carolyn (Fiona Shaw) appeared to betray Eve before Villanelle - portrayed by Jodie Comer - shot Eve, leaving her for dead.

Phoebe recently admitted she is keen to write herself into the third series of the drama as a victim of Jodie's alter-ego.

She said: "I was like, I am going to write myself a part so that I can be murdered by Jodie."

The 'Fleabag' actress also considered casting herself as Villanelle or Eve before series one, but the 34-year-old star decided against it because of age.

She said: "I just had a really strong instinct that there should be this age gap because I just felt like it was something I hadn't seen.

"I'm not a 25-year-old Jodie Comer - I mean, let's be frank. And I don't know if I could have scaled a wall quite like she could have done, and I'm not in my early forties either."

The BBC acquired a third series of 'Killing Eve' in April.

Charlotte Moore, BBC director of content, said at the time: "It's fantastic news that there will be a third series of this award-winning hit drama and we're delighted UK audiences will be able to see Killing Eve exclusively on the BBC.

"In the mean-time Villanelle and Eve will be returning to BBC One and BBC iPlayer for a second series soon."