BOSTON , Massachusetts ( CNN ) -- A 22-year-old medical student suspected of killing a woman he may have met through a Craigslist online ad was arraigned Tuesday and will be held without bail . Medical student Philip Markoff , 22 , appears in court Tuesday in Boston , Massachusetts . Philip Markoff , a second-year student at Boston University 's School of Medicine , listened intently but did not speak during the hearing in Boston Municipal Court . Dressed in a blue-striped shirt and slacks , Markoff was handcuffed and wearing leg irons . His attorney , John Salsberg , told reporters after the hearing that Markoff is `` not guilty of the charges . He has his family 's support . I have not received any document or report or piece of evidence other than what I heard in the courtroom . All I have at the moment are words -- no proof of anything . '' A woman identifying herself as Markoff 's fiancee also maintained his innocence in an e-mail sent to ABC News . Megan McAllister said Markoff `` is the wrong man '' and `` was set up . '' `` Unfortunately , you were given wrong information as was the public , '' McAllister wrote . `` All I have to say to you is Philip is a beautiful person inside and out and could not hurt a fly ! '' She accused Boston police of `` trying to make big bucks by selling this false story to the TV stations . What else is new ? ? '' Suffolk County District Attorney Daniel Conley told reporters , `` This was a brutal , vicious crime -- savage . And it shows that Philip Markoff is a man who 's willing to take advantage of women -- to hurt them , to beat them , to rob them . '' A procedural not-guilty plea was entered on Markoff 's behalf , Conley said . A Boston University spokeswoman said the school suspended Markoff , who has no criminal record , when it learned of the charges on Monday . Markoff is charged with killing 26-year-old Julissa Brisman of New York on April 14 at Boston 's Copley Marriott Hotel . Evidence from the scene suggests that Brisman `` put up a fight , '' prosecutor Jennifer Hickman said during the hearing Tuesday . Police said Brisman , a model , advertised as a masseuse on Craigslist , a popular online classifieds service . She sustained blunt head trauma , Hickman said , and was shot three times at close range . One of those bullets passed through her heart , killing her , she said . Markoff is also charged in connection with the robbery four days earlier of a woman at a Westin Hotel . In that case , the woman made arrangements to meet a man through Craigslist for a massage at the hotel , but was held at gunpoint and bound , Hickman said . She was robbed of $ 800 and personal items , and left tied to a door handle with duct tape over her mouth , Hickman said in court Tuesday . Police said earlier the Westin victim was 29 . She was not identified . Authorities believe the motive in Brisman 's death was robbery , Conley told reporters , and she was killed during a struggle . In executing a search warrant at Markoff 's home , police found a firearm , along with restraints and duct tape , he said . Watch police say assailant has perused Craigslist ads » . Surveillance videos from the hotel where Brisman was murdered showed a tall , clean-cut young blond man in a black windbreaker leaving the property , according to Boston police , who sought public assistance identifying the man . Police traced the Internet communications with Brisman to an e-mail account opened the day before her death , Conley said . Using Internet provider information , they found the computer was at Markoff 's residence in Quincy , Massachusetts , he said . Authorities put the home under surveillance , Conley said , and `` the case just begins to build from there . '' `` This poor woman , Julissa Brisman , no matter what choices she made or decisions she made in life , she is a human being who 's entitled to dignity and respect , '' Conley said . There may be more victims that authorities are unaware of , he said , adding that the prosecutor 's goal is to hold Markoff accountable , not to pursue women who may be advertising on Craigslist . `` If you have been a victim like these victims have , please come forward , '' he said . Markoff is `` bearing up , '' according to attorney Salsberg . `` It 's obviously a difficult time for anybody in these circumstances with the charges that have been brought against him . ... He 's pleaded not guilty . He is not guilty , '' said Salsberg . McAllister , in her e-mail to ABC , wrote , `` Philip is an intelligent man who is just trying to live his life , so if you could leave us alone we would greatly appreciate it . We expect to marry in August and share a wonderful , meaningful life together . '' The couple 's wedding Web site had been taken down or was unavailable as of Tuesday afternoon . Authorities in Boston are working with police in Warwick , Rhode Island , on what could be a related case . On April 16 at a Holiday Inn Express in Warwick , a man tied up and demanded money from a 26-year-old dancer who had posted a Craigslist advertisement , Warwick Police Chief Col. Stephen McCartney said . The robbery was interrupted when the woman 's husband entered the room . After pointing his gun at the husband , the suspect fled , McCartney said . He said no conclusions could be made yet , but allowed that the incident `` may be related to similar crimes occurring in the Boston area . '' Craigslist CEO Jim Buckmaster told CNN the company is `` horrified and deeply saddened that our community services have been associated in any way whatsoever with a crime of violence . '' He promised that Craigslist will evaluate the incident to see if additional measures could be introduced to protect users . CNN 's Mary Snow and Jason Kessler contributed to this report .
Not-guilty plea entered in Philip Markoff 's behalf in woman 's slaying in Boston . Prosecutors say semiautomatic firearm found in search of student 's home . CEO says Craigslist looking for ways to make site safer in wake of killing . TL;DR A Massachusetts man has pleaded not guilty to charges that he shot and killed a college student, then posted the victim's photo on his Facebook page.