Katarina

Katarina was played by Adrienne Hill in five episodes over two stories during November and December 1965. Katarina was killed in the very next story when she released an airlock sending herself and her captor into space, making her the first companion in the series to die.

SEASON 3 (1965-66): The Myth Makers, episode 4

SEASON 3 (1965-66): The Daleks' Master Plan, episodes 1-4