Boston cops on Monday night branded a 22-year-old pre-med student the "Craigslist Killer" who murdered a pretty New York masseuse and attacked at least two other escorts in hotels.

Philip Markoff, a Boston University student who lives in Quincy, a harborside town 10 miles south of Boston, will be arraigned on murder charges today.

Cops said the brainy blond doctor wanna-be has no rap sheet, but they think he has preyed on sex workers for a while. Police begged other victims to come forward.

Markoff will be charged with the murder of Julissa Brisman. The slain 26-year-old New Yorker advertised her services on craigslist and was shot in a posh Boston hotel April 14. Markoff also will be charged with kidnapping and robbery for an attack four days earlier in another luxury Boston hotel on an erotic dancer who advertised online. Police believe the April 16 armed robbery of a Las Vegas hooker in a Rhode Island hotel is also connected.