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Craigslist Update: The Ex And The Gun

Philip Markoff's ex-fiancee Megan McAllister after an April 2009 jailhouse visit.

BOSTON (CBS/AP) Philip Markoff, the man accused of killing a woman he met in the "erotic services" section of Craigslist, firmly stated "not guilty" on Monday when asked how he pleaded to the seven charges against him, including first degree murder, kidnapping, armed robbery and weapons violations.

Then Markoff stared straight ahead as prosecutors outlined their case during a brief arraignment in Suffolk Superior Court, which included a new revelation about how prosecutors believe Markoff obtained the murder weapon.

Prosecutors are saying the former medical student used someone else's identification - a New York man's license - in February at a gun shop in Mason, N.H., to buy the 9mm weapon that killed Julissa Brisman.

Assistant District Attorney Edmond Zabin said the gun used to kill Brisman was found in a hollowed-out copy of Gray's Anatomy in the Boston-area apartment Markoff shared with his then-fiancee, Megan McAllister.

Meanwhile, McAllister's attorney, Robert Honecker, revealed on Tuesday that McAllister told Markoff she may never see him again.

When McAllister visited Markoff in prison on June 11, she told him she was going to medical school and said it would be "a long period of time, if ever, that she would see him again," according to Honecker.

McAllister had previously called off plans for their August wedding in New Jersey.

Markoff is charged in the April 14 fatal shooting of Brisman, 25, of New York City, and the April 10 armed robbery of a prostitute at another posh Boston hotel.

Authorities say he used anonymous email addresses and pre-paid cell phones to set up meetings with the women he met through the online classified ads site Craigslist, where they had advertised in its "erotic services" category.

Read More CBS News Coverage Of The Case.>
Watch The Full 48 Hours Investigation, "Classified For Murder?"

June 22, 2009 - Accused Craigslist Killer Pleads Not Guilty
June 22, 2009 - Accused Craigslist Killer In Court
May 19, 2009 - "Craigslist Killer" Set To Appear In Boston Court This Week

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