Murder Murder was a criminal offence involving the deliberate killing of one or more individuals . Murdering a being could result in numerous penalties . Common ones were life imprisonment and execution . Killing beings on a battlefield did not usually count as murder . A killing classified as murder usually meant it was a targeted attack on a single individual . Serial killers would target multiple people over a period of time . Murder of an entire race was called genocide . It was one of the most serious crime s in the universe . Morality . The Seventh Doctor felt that , fundamentally , the only argument against murder that could stand up was utilitarian : " we don ' t [ ourselves ] want to get murdered . " ( PROSE : " Original Sin " ) The Doctor . The Doctor himself often battled over whether he " had the right " , to take another person ' s life , even toward altruistic ends . ( TV : " Genesis of the Daleks " , " The Parting of the Ways " , " The Witch ' s Familiar " ) In some cases , he took this option . ( TV : " The Wheel in Space " , " State of Decay " , " The Two Doctors " , " Dinosaurs on a Spaceship " , " Deep Breath " , COMIC : " Terrorformer " ) By his twelfth incarnation , the Doctor did not keep track of how many people he had killed , as he felt the need to move on and save other people ' s lives outweighed an obligation to honour those he had failed . ( TV : " Thin Ice " ) Earlier in his life , the Doctor did count the number of children on Gallifrey that died at the end of the Time War , when he destroyed the planet . The Tenth Doctor knew this number well , as 2 . 47 billion , but by his eleventh incarnation , he had forgotten this . Much like the Twelfth Doctor , the Eleventh Doctor expressed that " I moved on . " ( TV : " The Day of the Doctor " ) Examples of murder . In 1893 , the serial killer Clarence DeMarco was due to be executed for murdering fourteen women . He was spared due to his information on the Doctor ' s secret ( TV : " The Name of the Doctor " ) In December 1916 , the Russia n mystic Grigori Rasputin was murdered by Prince Felix Yusupov and his co - conspirators Grand Duke Dmitri Pavlovich and Vladimir Purishkevich in the Moika Palace , Prince Felix ' s residence , in St Petersburg in St Petersburg . ( PROSE : " The Wages of Sin " ) On 11 June 1925 , George Cranleigh murdered several servants at Cranleigh Hall in Oxfordshire . The Fifth Doctor was accused of having committed these murders . ( TV : " Black Orchid " ) In June 1926 , Professor Gerald Peach , Miss Chandrakala and Roger Curbishley were murdered by the Vespiform Reverend Arnold Golightly . He did so in the style of Agatha Christie ' s novels . ( TV : " The Unicorn and the Wasp " ) The Master murdered many people . His victims included Tegan Jovanka ' s aunt Vanessa and a policeman when they found his TARDIS in London on 28 February 1981 . ( TV : " Logopolis " ) Another of the Master ' s victims was Thomas Milligan , whom he murdered with his laser screwdriver in an alternative timeline in 2008 . ( TV : " Last of the Time Lords " ) In 1985 , Shockeye of the Quawncing Grig murdered Oscar Botcherby when he wouldn ' t accept a twenty narg note for payment of his restaurant bill . The Sixth Doctor later murdered Shockeye with cyanide . ( TV : " The Two Doctors " ) Oswald Danes was a convicted murderer , rapist and paedophile . In 2006 , he rape d and murdered 12 - year - old Susie Cabina . ( TV : " The New World " ) On 25 December 2006 , the Tenth Doctor accused Harriet Jones of mass murder when she ordered Torchwood to shoot down the escaping ship full of Sycorax . ( TV : " The Christmas Invasion " ) In 2008 , Lucy Saxon murdered the Master with a gun . ( TV : " Last of the Time Lords " ) River Song was convicted in the 52nd century of murdering the Eleventh Doctor at Lake Silencio on 22 April 2011 , but the Doctor faked his death using a Teselecta double , of which she was aware . She was sentenced to twelve thousand consecutive life sentences for the crime , but was later pardoned after the Doctor removed himself from all databases in the universe , erasing all evidence of his existence . ( TV : " Flesh and Stone " , " The Wedding of River Song " , " The Angels Take Manhattan " ) The Fourth Doctor murdered Mehendri Solon by injecting cyanide gas into his laboratory . ( TV : " The Brain of Morbius " ) In 2367 , the Eleventh Doctor murdered Solomon by placing a beacon ( being tracked by missiles ) on Solomon ' s spaceship . The missiles made contact with his spaceship moments later , killing Solomon . ( TV : " Dinosaurs on a Spaceship " ) In 2472 , Captain Dent murdered Eric and Jane Leeson using an IMC robot while using a visual trick to shift the blame on a giant lizard . ( TV : " Colony in Space " ) In 4126 , Klineman Halpen murdered Dr Ryder by throwing him into the Ood Brain . ( TV : " Planet of the Ood " ) A Dalek , pretending to help humans of the Dalek Foundation , murdered some survivors of a train crash and the medics tending to them while there were no witnesses . ( PROSE : " The Dalek Generation " ) In 50 , 000 , the bounty hunter Ahab murdered Zanthus Pia . He tried shifting the blame on K9 . ( TV : " The Bounty Hunter " ) In the far future , Sarah Jane Smith declared Styre a murderer after he shot down a retreating Roth . ( TV : " The Sontaran Experiment " )