text1: (CBS) The world knows Philip Markoff only by his headline nickname, the "Craigslist killer," but to Morgan Houston, he is more than a suspect or a defendant. To her, Markoff was a classmate and a friend - someone she thought she knew. "I thought he was very nice," she tells 48 Hours Mystery correspondent Richard Schlesinger. "He was dorky, but so many of us are. I mean, I can be a big dork, too. So, you can't hold that against him." Houston first heard that her college friend had been arrested from another friend on the social networking Web site, Facebook.
text2: Philip Markoff is a medicine student at the Boston University School of Medicine.