She played Liz Shaw, companion to the Third Doctor, in the 1970s.
She was great as Shaw, whose intellect was probably the highest of any of the other TV companions.
She continued acting until about four years ago. But, as is the case with people who have played on Doctor Who, she’s best remembered for her time in the blue box. And on this show, she was lovely and always engaging.
Anyway. Sympathy to her family and friends.