A random match between DNA recovered from beneath the fingernails of 18-year-old Noemi Roman and someone other than the man on trial for her murder would be scientifically unprecedented, with odds of about 7 billion to one against it, a Suffolk County prosecutor told a Superior Court jury today.

“With the exception of identical twins, it has never been reported anywhere in the world that two people had the same [DNA] profile at 15 locations,” Assistant District Attorney Holly Broadbent said during closing arguments in the trial of KURVIN RICHARDSON (D.O.B. 10/3/70), whose DNA matched 15 out of 16 genetic marker locations tested by forensic experts during the 2005 reinvestigation of Roman’s 1990 stabbing death in her Peterborough Street home.

“It’s never been reported with 14 locations,” Broadbent continued. “It’s never been reported at 13 locations. It’s never been reported at 12 locations … It’s been reported at nine locations, and those individuals were siblings.”

Broadbent urged jurors not to be distracted by other men who had been evaluated and ultimately dismissed as suspects.

“Drag the past out into the light,” she said, naming the father of Roman’s infant son, who was found by the dead woman’s side and spattered with her blood when Boston firefighters broke into the apartment on May 31, 1990, and found aerosol cans in a burning stove; her boyfriend at the time of her death; and a petty criminal who tried to cash one of her checks. Boston Police eyed each as a possible suspect at the time, but none was arrested and each was ultimately excluded as Roman’s killer.

“When you look at the DNA evidence, there are no other suspects,” she said.

Broadbent also reminded jurors of the calling card bills to Roman’s telephone account that began appearing after her death and the fact that Richardson admitted to making them.

“In the aftermath of the murder, he began using her calling card on a regular basis. Calling his girlfriend [and] his ex-girlfriend …. There are no calling card calls before her death,” Broadbent said, pointing to an enlarged copy of Roman’s billing statements before and after she was fatally stabbed in the throat.

“The last thing Noemi Roman saw before she died was her son,” Broadbent said. “She put up a fight …. She fought, and she got just enough of her killer’s skin beneath her nails to tell you what had happened.”

After Broadbent’s closing argument, Judge Judith Fabricant instructed jurors on the law. If they do not reach a unanimous verdict this afternoon, they will return and continue deliberations tomorrow.

Fabricant yesterday took the unusual step of revoking Richardson’s bail following the conclusion of evidence yesterday; he was remanded to the custody of the Suffolk Sheriff’s Department.

Richardson is represented by attorney Steven Sack.