THE BABY-FACED hooker who allegedly watched while her ex-con boyfriend raped and strangled a New Jersey teen tried to sell herself for sex on craigslist a day after the murder, police sources said. Krystal Riordan, charged with helping Draymond Coleman ditch the body of 18-year-old Jennifer Moore, tried to make money by billing herself as "Lisa" on the popular online flea market, a police source said. The 20-year-old posted her ad July 26 - just a day after police say Coleman strangled and suffocated Moore as Riordan watched, and did nothing. "Cold-hearted, to say the least," said another police source. Riordan billed herself as a New Jersey escort working out of Weehawken, where the murder occurred. Her ad offered a "$150 special." Cops said that after Riordan watched the murder in a cheap motel, she helped Coleman, 34, stuff Moore's body in a suitcase and toss it in a Dumpster. Riordan's family said the troubled young woman was under Coleman's thumb, and had been selling her body throughout their two-year relationship to meet his demands for money. The couple has a year-old daughter. Coleman, a small-time pimp, is charged with murder. Riordan is accused of tampering with evidence and hindering prosecution. Coleman allegedly enticed Moore into a taxi as she stumbled drunken and lost along the West Side Highway after a night of partying at the Guest House in Manhattan. The duo rode to the Park Avenue Hotel in Weehawken, where security video revealed Coleman half-carrying Moore through the lobby. Riordan was apparently furious that Coleman brought another woman to the motel where the couple had been staying - and then stuck her with paying for the taxi ride. agendar@nydailynews.com