Osi Okerafor and Elinor Lawless have joined the cast of 'Casualty'.
Osi Okerafor
The 'Death In Paradise' actor and 'Doctors' star have stepped in as locum registrar Matthew and consultant Stevie respectively.
In a statement, Loretta Preece - Series Producer of 'Casualty' - said: "I am delighted that Osi and Elinor will be joining the Casualty family.
"As an actor, Osi has it all; he's handsome and debonair, sensitive and steadfast, passionate and unpredictable.
"Osi has been delightful to work with and he and Olivia have a very special on-screen bond.
"With Osi's beautifully layered performance we slowly reveal some deep undercurrents - he is far more than a classic romantic leading man.
"Eli is an exceptional actress and a force of nature. With Stevie, Eli brings a new and dangerous energy into our world – she's charismatic, contemporary, compelling and on occasion very unsettling.
"Her wonderful character and additive backstory is an exciting part of defining a new and exciting era for Casualty as we go into our 35th year."
Osi - whose character Matthew still has a "deep and enduring love" for old flame Fenisha Khatri (Olivia D'Lima) - is "excited" to see how viewers react to him coming onto the BBC show later this month.
He said: "It's a pleasure to become a part of the Casualty team. Everyone here is so genuinely friendly and it's a very exciting environment to work in.
"I'm excited for viewers to see Matthew's love for his patients and his willingness to do whatever it takes to care for them; it's a quality I really admire in him."
And Elinor - whose character will debut later in the year as part of Casualty's 35th anniversary episodes - has given a hint of what's to come.
She added: "I am absolutely thrilled to be joining the wonderful cast of 'Casualty'!
"Stevie Nash is certainly a force to be reckoned with and looks set to ruffle a few feathers in the Holby ED!"