Craigslist Killer Commits Suicide 15.44K Adrian Chen 08/15/10 12:50PM Filed to: Crime Crime Philip markoff Craigslist killer Craigslist Ap pic Boston University medical student Philip Markoff allegedly killed an escort he hired through Craigslist and robbed a couple more. Days after he was arrested on April 20, 2009, he was placed on suicide watch. He killed himself in jail today.