As reported by GallifreyNewsBase, Doctor Who guest actor Mark Jones died recently, aged 70.
Following appearances in A Family at War (1970-72) and Z Cars (1971), Jones played Arnold Keeler in The Seeds of Doom, the 1976 classic that pits the Fourth Doctor (Tom Baker) and Sarah Jane Smith (Elisabeth Sladen) against the might of not one but two alien Krynoid monsters, aggressive, intelligent plant life capable of turning all plantlife on Earth against not just mankind but all other animals.
Mark Jones not only played the botanist Arnold Keeler in the adventure, he also underwent heavy makeup to portray the effects of the Krynoid infection on Keeler and voiced the larger version of the creature following its cultivation by the insane Harrison Chase, making him pretty much the unsung hero of the story.
With his last listed TV appearance in Red Dwarf, Jones also appeared in The Empire Strikes Back as an Imperial Officer. HeÂ died on 14th January 2010 in Shrewsbury, Shropshire.