Kate O'Mara, star of Dynasty, stage and screen (esp. in the UK) has passed away after a short illness.

She was also The Rani, one of the Doctor's few Gallifreyan enemies - appearing in both "The Mark of the Rani" and "Time and the Rani" (also the Children in Need special Dimensions in Time).

R.I.P Kate O'Mara

BBC story here