WASHINGTON (WJLA) -- Sources tell ABC7 News that 60-year-old Giles Warrick, the accused Potomac River rapist, is back in Washington, DC Thursday morning and spent the night in lock-up. ABC7 learned that he could face a judge in DC Superior Court Thursday afternoon.
Warrick is charged with first-degree-murder but is also accused of nearly a dozen sexual assaults between Maryland and the District.
Police and the FBI traveled to Conway, South Carolina last week and arrested Warrick at his home where he was living for about a year.
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Authorities say they identified Warrick through forensic genealogy and DNA from different crime scenes.
One of the victims was 29-year-old Christine Mirzayan. Warrick raped and murdered Mirzayan and attacked at least nine other women in the 1990s, according to authorities.
Mirzayan, a National Academy of Sciences intern, was walking home from a cookout in Georgetown on an August evening in 1998 when she was assaulted and killed. Police say she was bludgeoned with a 73-pound rock.
Her death was linked to other assaults in the area by the offender's violent methods and DNA, authorities say.
Between 1991 and Mirzayan’s murder, the Potomac River Rapist "brazenly and brutally preyed upon women in the Washington area," the FBI said. "Victims were attacked in their homes and included an 18-year-old babysitter and a mother whose infant was in the house at the time of the attack."
Warrick was cleared for extradition Wednesday and U.S. Marshals transported him and released him to DC Police last night.
He was interviewed by detectives and authorities are investigating if Warrick is linked to similar crimes in South Carolina.