The Craigslist Killer

By day, Philip Markoff wore the mask of a young, upwardly mobile medical student. But by night, he took on another persona and was known as the Craigslist Killer. Tricia Leffler had arranged to date with a man over Craigslist who'd given her what she assumed was a false name. 25-year-old Jaleesa Brismen was found bound and gagged on the hotel room floor in April 2009.