Marty Kirkby is a fictional character from the BBC medical drama Casualty, portrayed by actor Shaheen Jafargholi. He first appears in the thirteenth episode of the thirty-fourth series, first broadcast on 17 November 2018. Jafargholi's casting was announced on 1 August 2018 and he was invited to read for the role shortly after finishing filming on EastEnders. Marty is characterised as a young and fashionable student nurse with a "razor sharp wit". He is a confident nurse who has a blunt bedside manner and excellent clinical skills.

Shaheen Jafargholi is a Welsh actor and singer. In 2009, he finished in seventh place on the ITV competition series Britain's Got Talent. Since then, he has portrayed the roles of Shakil Kazemi in EastEnders and Marty Kirkby in Casualty. Appears in the second series of BBC Three horror/comedy drama Wreck as Billy