Born in Manchester, Marsha was interesting in acting at a young age, doing theater with the Oldham Theatre Workshop. That lead to her role in Prime Suspect 5: Errors of Judgement, Brazen Hussies and her breakout roles in the series Playing the Field and Where the Heart Is. She then moved to London and did theater in the West End, and made the break into US television with her role of Nessa Holt in Las Vegas, where she stayed for 2 seasons.

After that, Marsha took roles Black Night, played Edddie Murphy’s wife in The Haunted Mansion, as well as her guest spots on Cane, Life and on Lost. Her role of Vicki in Pure brought her acclaim and she was awarded a BFM award in 2002.

In 2007, she was cast in the short term series Easy Money on the CW. She appeared on Make it or Break it and a few episodes of General Hospital as part of the James Franco storyline. Marsha took part in the pilot of “White Collar” but her character Diana wasn’t seen again to the season finale, where she was then made a regular character for Season 2.