Assassination

Assassination was a specialised form of murder, in which the victim was a prominent individual — often the leader of a government. A person who carried out an assassination was called an assassin.

The First Doctor told Vicki that it was acceptable to hire an assassin in Roman times, and these assassins were preferably "dumb", i.e. mute, so that they couldn't speak out against their employer. (TV: "All Roads Lead to Rome")

According to Ian Chesterton, Hashashin was used in English in the form of the word assassin. (TV: "Five Hundred Eyes")

Occurrences
In 64, a centurion hired Ascaris to assassinate the lyre player Maximus Pettulian. After the assassination was carried out, the First Doctor posed as Maximus, making it appear that he had some somehow survived. Believing the Doctor to be Maximus, Ascaris tried to assassinate the Doctor, but was overpowered by the Doctor and Vicki. (TV: The Romans)

In 1289, the Mongol warlord Tegana tried and failed to assassinate Kublai Khan. (TV: "Assassin at Peking")

In 1400, there was a failed plot to assassinate King Henry IV of England and restore the deposed Richard II to the throne. The conspirators included the author Geoffrey Chaucer and his son Tom. (AUDIO: The Doctor's Tale)

In 1628, George Villiers, Duke of Buckingham was assassinated by John Felton. (AUDIO: The Church and the Crown)

In April 1865, the Fifth Doctor averted an assassination attempt upon the life of President Abraham Lincoln in Richmond, Virginia. (PROSE: Blood and Hope)

During the 19th century, there were several attempts to assassinate Queen Victoria. (TV: Tooth and Claw)

On 28 June 1914, the assassination of Archduke Franz Ferdinand of Austria-Hungary by Gavrilo Princip in Sarajevo, Bosnia triggered a series of events that rapidly escalated into Earth's first global conflict: World War I. Unknown to the general populace, however, the start of the war was influenced by the Nemesis. (PROSE: Human Nature; TV: Silver Nemesis, The Family of Blood)

The Ninth Doctor and James Stevens were present at the assassination of U.S. President John F. Kennedy in Dallas, Texas on 22 November 1963. (TV: Rose, PROSE: Who Killed Kennedy)

On 29 November 1963, the British Minister of Defence Stephen Mulryne was assassinated by David Ritchie. (AUDIO: 1963: The Assassination Games)

In 1968, Martin Luther King was assassinated. This led to many riots in the United States. (AUDIO: The Age of Revolution)

In 1981, there was a failed attempt to assassinate the Pope. (PROSE: The Assassin's Story)

On 30 March 1981, John Hinckley Jr attempted to assassinate US President Ronald Reagan. (PROSE: The Assassin's Story)

In 2002, Stephen Keyser and Walter Jacobs made separate attempts to assassinate Sherilyn Harper, both of which failed. (AUDIO: The Fearmonger)

In 2008, used the Toclafane to assassinate President Arthur Coleman Winters. (TV: The Sound of Drums)

In 2097, the female Pope visited Mars to anoint the first Martian bishops. This was done to improve relations between Martians and the humans. The Daleks made an assassination attempt. (PROSE: The Gallifrey Chronicles)

The Fourth Doctor was accused of assassinating the Lord President on Gallifrey. (TV: The Deadly Assassin)

Kevin was a hired assassin sent by Drel McCavity. (PROSE: The Resurrection Casket)

The First Doctor witnessed the assassination of President William McKinley. (PROSE: Byzantium!)

"Executive action" was old CIA terminology for assassination. The pharmaceutical company The Pharm granted Billy Davis executive action for dealing with test subjects for Reset. (TV: Reset)

Like World War I, World War VI was sparked by an assassination. The assassination of Ingrid Bjarnsdottir, commissioner of the Icelandic Alliance, by the Peking Homunculus began a war between them and the Supreme Alliance of Eastern States led by Magnus Greel in the year 5000. (TV: The Talons of Weng-Chiang; PROSE: Doctor Who and the Talons of Weng-Chiang; AUDIO: The Butcher of Brisbane)

In an alternative timeline, Margaret Thatcher, the Prime Minister of the United Kingdom, was assassinated by her fellow Conservative Party politician Heathcliffe Bower in 1984. However, the proper timeline was restored by the Fifth Doctor. (PROSE: The Assassin's Story)

Behind the scenes

 * Assassins are, by definition, deadly. This makes the title The Deadly Assassin redundant, which is why the title was gently mocked by the Comic Relief special, The Curse of Fatal Death.