Assassination

Assassination was a specialised form of murder, in which the victim was a prominent individual — often the leader of a government.

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

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. (PROSE: Who Killed Kennedy, TV: Rose)

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

Queen Victoria had several assassination attempts made on her life. (TV: Tooth and Claw)

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. (TV: Silver Nemesis, TV: The Family of Blood)

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

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

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

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

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

"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 also 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.