BOSTON, Massachusetts (CNN) -- Friends and acquaintances of Philip Markoff, a medical student accused of killing a woman he may have met through a Craigslist online ad, described the 23-year-old as a model student. Medical student Philip Markoff, 23, appears in court Tuesday in Boston, Massachusetts. "My girlfriend actually rode the elevator with him a lot alone; it's kind of freaking her out now," said Patrick Sullivan, who lived in the same apartment building as Markoff in Quincy, Massachusetts, a Boston suburb. "She thought he was kind of the all-American, good-looking guy," Sullivan said. "When she saw him on TV yesterday, she even remarked, 'I can't believe it's him. I always thought he had such a great smile, and he was so nice to me.'"
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Procedural not-guilty plea entered in Craigslist slaying case
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Suspect Philip Markoff has been suspended from Boston University med school
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Evidence suggests that victim Julissa Brisman "put up a fight," prosecutor says
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Markoff also charged in connection with an April 10 robbery
Julissa Brisman
Police have said that @placeholder, a model, advertised as a masseuse on Craigslist, a popular online classifieds service.
Julissa Brisman
Surveillance videos from the hotel where @placeholder was killed showed a tall, clean-cut young blond man in a black windbreaker leaving the property, according to Boston police, who had sought public assistance in identifying the man.
Julissa Brisman
Police traced the Internet communications with @placeholder to an e-mail account that had been opened the day before her death, Conley said.
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Using Internet provider information, they found the computer was at Markoff's residence in @placeholder.