NY- 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.

Back story: Krystal Riordan – the young hooker accused of watching her boyfriend allegedly rape, sodomize and kill a New Jersey girl – has never been at peace.

Even as a young child, lovingly tucked into her bed in her family’s sprawling suburban home, Riordan would jolt from sleep and scream horribly.

Her mother and father, who adopted Riordan at age 5 and also welcomed her younger sister into their Connecticut home, believed the night terrors would eventually go away.

They hoped that with enough love, Riordan would overcome the abuse she suffered as a baby.

“She was never in serious trouble,” her father, Timothy Riordan, told the Daily News in an exclusive interview. “Most of what we did was to keep her out of trouble.”

But early last week, Krystal Riordan, 20, stood in a dingy motel room in Weehawken, N.J., and watched as her ex-con boyfriend raped and sodomized an unconscious teen he had abducted in Manhattan, police say.

When 18-year-old Jennifer Moore attempted to fight off her attacker, Riordan allegedly did nothing to help her. Instead, she stood by as her boyfriend, Draymond Coleman, 34, a small-time pimp, beat and strangled Moore to death, police say.

Even after Moore was dead, Riordan allegedly did not try to walk away. She helped Coleman carry Moore’s naked corpse, stuffed into a suitcase, to a Dumpster two blocks away, where Riordan and Coleman threw the body like trash, police say.

“To think of the possibility that a child of your own, adopted or otherwise, could have anything to do with it – that’s heartbreaking,” Riordan’s father said.

Wearing a neatly pressed white shirt, Timothy Riordan, a certified public accountant, struggled for words at times while talking to The News outside his upscale home in a rural section of Orange, Conn.

“I never knew Krystal to hurt anybody. The only person she hurt was herself,” he said, adding that he would never turn his back on his troubled daughter.

“As a parent and a Christian you never close the door,” he said. “There’s always hope – but there also has to be reality.”

Desperate to help Krystal when she was a teen, her parents sent her to the Elan School in Poland Spring, Maine, about 140 miles north of Boston.

The school – a live-in rehab center for children of the wealthy that charges about $49,000 a year – is notorious because it is where Kennedy cousin Michael Skakel of Greenwich, Conn., allegedly confessed to killing his 15-year-old neighbor, Martha Moxley, in 1975.

But even beyond Skakel, the school’s rigid methods have come under scrutiny. Critics call the techniques abusive, but supporters, including some graduates, credit the center with turning around many lives.

The school’s Web site says the highly structured environment teaches kids a work ethic: “They learn that occasionally failing is part of life, that they can start again and succeed, and that development of resilience is fundamental to success.”

But Elan did not lead Krystal Riordan to a better life. Instead, her sister Nicole Riordan says, the rehab center was the reason Krystal met Coleman.

A classmate introduced the pair about two years ago, the sister said. The couple have a 1-year-old daughter, Trinity, who is in foster care.

When Nicole visited her sister in New York about 18 months ago, she said, it was clear Coleman was pimping Krystal out.

“He wanted her to go out and make money. She didn’t want to go, but he kept saying, ‘Oh, come on, you can make some money.’ So she went,” the sister told The News.

“She’d be gone an hour and have to hand over the money as soon as she came back. But she didn’t want to talk about it.”

Timothy Riordan said his troubled daughter didn’t tell him about the prostitution, adding, “There are things that you may suspect and there are things that you may know.

“We never approved of her association with him,” he said of Coleman.

Krystal Riordan, who had prior arrests on drug and prostitution charges in Connecticut, is being held on $1 million bail in New Jersey. She is charged with evidence tampering and hindering prosecution in Moore’s death.

Coleman, who has more than 16 arrests, is fighting extradition to New Jersey, where he is charged with murder.

Meanwhile, Moore’s family gathered yesterday to plan her funeral in Harrington Park, N.J., an affluent town similar to the area in which Krystal Riordan grew up.

Timothy Riordan said he could sympathize with the trauma Moore’s parents were feeling because one of his two sons was killed in an accident at 21.

“I know the pain these parents are going through,” he said. “My thoughts are just how long and how awful a period they are going to have.”

He added that he has not seen Krystal since May.

“We’ve always kept the door open,” he said, “so she could work through some of the things that have haunted her all her life.”