The actor Barry Jackson has died at the age of 75.
Jackson played three roles in Doctor Who, appearing in six episodes of the series. In 1965 he played Ascaris in the William Hartnell story The Romans, a mute assassin who tried to kill the Doctor believing he was the lute player Maximus Pettulian. He returned to the series in Mission to the Unknown where he played Jeff Garvey, a member of the expedition to the planet Kembel.
His final appearance in the series was as Drax - a renegade Time Lord and previous friend of the Doctor on Gallifrey - in the 1979 story The Armageddon Factor.
Away from Doctor Who, Jackson was best known for playing pathologist Dr George Bullard in Midsomer Murders for more than 10 years. He appeared in the first episode of the detective drama, staying until 2011.
His long career on television began in 1960, with the role of the Earl of Surrey in the BBC series An Age of Kings. Countless roles followed in other shows, including Doctors, Heartbeat, The Bill, A Touch of Frost, Bernard's Watch, Three Seven Eleven, All Creatures Great and Small, Hard Cases, Coronation Street, The Onedin Line, Blake's 7, Crown Court, Secret Army, Poldark, Z Cars, Dixon of Dock Green, The Adventures of Black Beauty, Harriet's Back in Town, Spy Trap, Adam Adamant Lives! and A for Andromeda.
Films that he appeared in included Ryan's Daughter and Barry Lyndon.
Jackson's agent said the actor died at home in north London surrounded by his family.