12 April 1989: death of Gerald Flood, who played Kamelion in 1983 and 1984, and also King John in The King's Demons (1983)
ii) broadcast anniversaries
12 April 1969: broadcast of sixth episode of The Space Pirates. Caven is defeated and captured; the Space Pirates are neutralised.
12 April 1975: broadcast of sixth episode of Genesis of the Daleks. The Daleks take over the bunker, killing everyone including (apparently) Davros; but the Thals bury them for centuries.
(Intersting that the six episodes of The Space Pirates and Genesis of the Daleks were broadcast on exatly the same dates, six years apart. It is safe to say that most people have a rather different judgement of the two.)
12 April 2003: webcast of "No Child of Earth, part 3", tenth episode of Death Comes to Time.
12 April 2008: broadcast of The Fires of Pompeii, first apearance of future regulars Karen Gillan and Peter Capaldi. The Doctor adn Donna are in Pompeii; and it's Volcano Day.
12 April 2010: broadcast of The Last Oak Tree, fourteenth episode of the Australian K9 series. Panic ensues when a museum exhibit is stolen. K9, Starkey, Darius and Jorjie are on the trail of the culprit. They find a giant menace hiding in London's abandoned sewers. Is the alien the threat or is Drake the real evil? Starkey and K9 face annihilation as they try to rescue the alien's hatchlings before a bomb destroys them all.