( CNN ) -- A medical student accused of killing a masseuse in a Boston , Massachusetts , hotel room will be charged in a hotel assault in Rhode Island , the state attorney general said Monday . Accused `` Craigslist killer '' Phillip Markoff is now facing additional charges in Rhode Island . Police said the attacker in both cases apparently responded to the victims ' listings on the Craigslist online classified ad site . Philip Markoff , 23 , will be charged with assault with the intent to rob , assault with a dangerous weapon , possession of a handgun and use of a firearm while committing a crime of violence , said Rhode Island Attorney General Patrick Lynch . The charges stem from an April 16 robbery attempt at a Holiday Inn Express in Warwick , Rhode Island . Watch why Rhode Island officials issued an arrest warrant » . Markoff , a second-year student at Boston University 's School of Medicine , previously was charged with killing Julissa Brisman on April 14 at a Boston hotel . Police said Brisman , a New York resident , was a model who advertised as a masseuse on Craigslist . Prosecutors say she was shot three times at close range and suffered blunt head trauma . Markoff also has been charged in connection with an April 10 robbery of a woman at another hotel in Boston . She was robbed of $ 800 in cash and $ 250 in American Express gift cards , according to police reports . Watch report on Markoff 's alleged gambling problem , underwear collection » . The incident also is linked to a Craigslist ad , police said . Markoff pleaded not guilty in the April 14 and April 10 incidents and is being held without bail . Lynch called the Rhode Island case a `` very stark , difficult , horrific reminder that there are predators out there ; there are bad people out there , '' and called for new Internet safety measures . Markoff 's attorney , John Salsburg , did not respond to requests from CNN for comment .
Case marks third time Philip Markoff accused of finding pornography on Craigslist . Assault with dangerous weapon among charges leveled in armed robbery . He pleaded not guilty and is being held without bail . He also charged with murdering a masseuse , robbing another woman .