( CNN ) -- Police in Boston , Massachusetts , are searching for a man suspected in the murder of one woman and the armed robbery of two others , all of whom , they say , he may have met through their Craigslist ads for personal services . Julissa Brisman , 26 , was described as `` a really sweet , goofy , energetic kid . '' Officers discovered New York resident Julissa Brisman , 26 , unconscious with multiple gunshot wounds at Boston 's Copley Marriott Hotel on Tuesday night . She was transferred to Boston Medical Center , where she died shortly afterward . Police said Brisman , a model , offered massages via Craigslist , a popular online classified ad service . The confrontation between Brisman and her killer seems to have begun as an attempted robbery , police said . `` It appears that there was a struggle between the victim and the suspect in the threshold of the hotel room immediately prior to the shooting , '' the Boston Police Department said in a statement on its Web site . Police speculate the man may also be responsible for the recent robberies of two other young women who offered personal services via Craigslist . Four days before Brisman 's slaying , a 29-year-old woman was robbed at gunpoint at a Westin Hotel in Boston . Police spokesman Joe Zanola would not disclose the details of her Craigslist ad but said she and Brisman were `` involved in similar professions . '' On Thursday night at a Holiday Inn Express in Warwick , Rhode Island , a man tied up and demanded money from a 26-year-old dancer who had posted a Craigslist advertisement , according to Warwick 's police chief , Col. Stephen McCartney . The robbery was interrupted when the woman 's husband entered the room . After pointing his gun at the husband , the suspect fled , according to McCartney . He said that no conclusions could be made but allowed that the incident `` may be related to similar crimes occurring in the Boston area . '' Matthew Terhune , a photographer who met Brisman when he took pictures of her for a calendar last year , described her as `` just a really sweet , goofy , energetic kid . '' He added that she was enrolled in Alcoholics Anonymous and was contemplating counseling fellow recovering addicts . He had been unaware of her side job as an Internet masseuse . Surveillance videos from the hotel where Brisman was murdered showed a tall , clean-cut young blond man in a black windbreaker leaving the property , said the Boston Police Department , which is asking the public 's help in identifying the man . Representatives from Craigslist did not respond to a request for comment .
26-year-old died after attack at Boston hotel on Tuesday . Police say she posted Craigslist ad offering massages . Man may be behind two recent robberies , they say . The Associated Press contributed to this report.