Roger Delgado played the first incarnation of the Doctor’s nemesis The Master, making his first appearance in ‘Terror Of The Autons‘. Delgado was finding it difficult to find other work so, at his request, a serial to be called ‘The Final Game’ would end the story arc with the Master with the character apparently killed off.
However, before the story could be made, Delgado was killed on this day in 1973, along with two film technicians when a car they were travelling in went off the road into a ravine in Turkey. He was shooting a comedy role in a French mini-series. He was the first major Doctor Who actor to die during the time of the classic series.
Read more about Roger Delgado at tardis.wikia.com.