It's been reported this morning that Dave Martin - writer of eight "Doctor Who" adventures, and creator of K9 - has died. Outpost Gallifrey had this to say:
K9 - CREATED BY BOB BAKER AND DAVE MARTIN
"Martin had a long and distinguished writing career, working mainly with his long term writing partner Bob Baker.
In 1971 they were asked to write their first story for Doctor Who. The Claws of Axos was the first of eight stories over nine seasons creating some of the series most iconic characters and most loved stories.
K9 also made a fleeting appearence in "The Sarah Jane Adventures" pilot episode, "Invasion of the Bane" - after Bob Baker and Dave Martin kindly gave their permission for the robot mutt to be used. K9 lives on in the Bob Baker series "K9 Adventures"; which Dave had little to no involvement in.
Everybody at Sarah-Jane.tv wishes their deepest sympathies to Dave's family and friends at this incredibly sad time.