Colin Baker, who played a former incarnation of The Doctor, wrote on Twitter:
Oh my goodness. Kate O'Mara is no longer with us. Sad sad news. A delightful, committed and talented lady and actress. We are the poorer
More top news
Republican presidential candidates have taken part in a fiery debate as they clashed over foreign policy and immigration.
Four British rowers who became stranded in the Atlantic Ocean after their boat capsized and they lost their oars have been rescued.
The £15 'liquid biopsy' looks for fragments of genetic material in a tiny drop of saliva.