Suzie Costello Suzie Costello was the former second - in - command of Torchwood Three in the early 21st century up until late 2007 when she committed suicide . Although she wasn ' t alone in having used Torchwood - acquired technology to her own advantage , she had been the most destructive . Suzie , unlike her other teammates , had malicious ulterior motives and carried them out through secret gambits , killing several people . Despite her troubled life , she harboured a sadistic cruelty that led to her early demise . However , Suzie ' s influence continued to cause bedlam after her death , through a plan to resurrect herself should she perish , which was eventually undone . She would be revived yet another time by alien technology , only to face a final death beyond any hope of return . Biography . Early life . Growing up , Suzie was abused by her father , and grew to hate him as a result . ( TV : " They Keep Killing Suzie " ) Working for Torchwood . When she was headhunted into Torchwood Three by Jack Harkness , ( AUDIO : " Moving Target " ) Suzie was on the run and had wiped her files clean . ( TV : " They Keep Killing Suzie " ) During her time with Torchwood , Suzie had an affair with medic Owen Harper , and placed triggers on Pilgrim member Max Tresilian for two years , using retcon to remodel his mind around poems by Emily Dickinson in a scheme that would lead to her resurrection with the resurrection gauntlet in the event of her death . ( TV : " They Keep Killing Suzie " ) Suzie was present in the Hub on 26 March 2005 when it was frozen in a time bubble for a day by Torchwood One ' s Rajesh Singh so that director Yvonne Hartman could procure a Drahvin scanner from the Hub unhindered . ( AUDIO : " One Rule " ) On 29 November 2006 , Suzie woke up late to find the whole world frozen in time . The only other person unfrozen was a woman named Alex . After spending days defending Alex from aliens that had paid for an opportunity to hunt her , she realised the only way to end the hunt was for Alex to die . The Referee of the hunt told Suzie that Alex ' s death would have no effect on the world , so she used her last bullet to kill her , resuming time . ( AUDIO : " Moving Target " ) Suzie found Object One in an Ovid factory . In order to get the object away from Torchwood Cardiff , Jack had her call Yvonne Hartman and give her the object . Yvonne promised to talk to her about the advancement of her career in Torchwood . Jack thanked her , telling her that he had assumed she was just a " daddy ' s girl " . ( AUDIO : " The Torchwood Archive " ) Death . The resurrection gauntlet worked particularly well on the victims of violent deaths , ( TV : " Everything Changes " ) and more so on injuries inflicted by the life knife . ( TV : " They Keep Killing Suzie " ) Later in 2007 , Costello committed a series of three murders with the life knife to improve her use of it . She was discovered by PC Gwen Cooper . Her attempt to kill Jack Harkness in her escape was thwarted when Jack ' s immortality was revealed . Suzie took her own life . ( TV : " Everything Changes " ) This was another step in her plan to revive herself . Costello ' s body was placed in the Torchwood cryo - chamber s and her worldly possessions collected and placed into storage , as was common practice for deceased Torchwood operatives . ( TV : " They Keep Killing Suzie " ) Resurrections . Three months after Suzie ' s death , Max killed three people in the space of a day , marking the walls in blood with the word " Torchwood " to draw Torchwood ' s attention . After discovering her involvement with Pilgrim , Torchwood decided to revive Costello , ironically with the very resurrection gauntlet that Costello had killed for earlier . Gwen wielded the glove this time , but rather than reviving Costello for only a few minutes as usual , the glove revived her apparently permanently . This left Torchwood in a quandary since they now had a dead person who had come back to life , yet among other things still had a severe head injury caused by the suicide bullet . Unknown to the team , Costello had foreseen this and through a mental link in the glove , Gwen was forced to transfer part of her essence , which Costello used to heal her injury , an action which slowly killed Gwen . She also visited her father and murdered him . Seeing the effects on Gwen , Jack asked Costello to give up her restored life . She refused . Faced with Gwen ' s imminent death , Jack shot Costello down in cold blood . However the link via the gauntlet prevented Costello from dying . Only after Jack ordered Toshiko Sato to destroy the gauntlet did Costello die again . Her body was returned to the cryo - chamber . ( TV : " They Keep Killing Suzie " ) Following the destruction of the Hub in 2009 , ( TV : " " ) a piece of alien technology concealed within her body was activated , enabling Suzie to be resurrected for a third time . After murdering one young worker at the site , she fled the area , undertaking the alias Sue Costa . A series of brutal murders followed until Suzie was finally tracked down before then being enticed back to the hub . There she met DCI Tom Cutler with whom she had previously shared an intimate relationship . Tom attempted to negotiate with Suzie before the hub was destroyed a second time . Half an hour later the two were locked in each others arms before the explosion took both their lives . The remains of both Tom and Suzie were later discovered by a tearful PC Andy Davidson . ( PROSE : " Long Time Dead " ) Legacy . Gwen mentioned how Suzie was resurrected by the glove when Martha Jones asked how they obtained the gloves after Jack resurrected Owen using one . ( TV : " Dead Man Walking " ) Personality . Suzie was a very cold , selfish , strong - willed and pitiless woman , completely willing to let Gwen die when it meant she got to live . She was highly manipulative , giving Max Tresilian retcon once a week over a two - year period in order to turn him into her " Trojan horse " for her plan . She developed a worldview from alien s such as Weevil s coming through the Cardiff Rift and found murder as acceptable a means as any for achieving her goals , particularly to unlock the secrets of the resurrection gauntlet . She also showed a vengeful side , unplugging her father ' s life - support system in return for abusing her . ( TV : " Everything Changes " , " They Keep Killing Suzie " ) Suzie was shown to be self - loathing when she said to Jack that Gwen was a better second - in - command than she ever was , though this was likely just an attempt to make Jack feel sorry for her . She was also shown to be a coward when facing death the second time , despite having died once before and by suicide , even going so far as to say that Jack couldn ' t kill her and that she was all that was left of Gwen . However , Jack saw right through this and gunned her down , saying he didn ' t see one bit of Gwen in her . ( TV : " They Keep Killing Suzie " )