The prime suspect in the disappearance of a University of Virginia student was charged Monday in an unsolved 2005 rape case.

Jesse Leroy Matthew Jr., the suspect in custody for the abduction of 18-year-old Hannah Graham, was indicted on charges related to a 2005 rape in Fairfax, Va., Fairfax County Commonwealth's Attorney Ray Morrogh said in a press conference. 

Searchers found human remains on Saturday that could be those of Graham, a University of Virginia sophomore, who has been missing since Sept. 13, police said. Her disappearance is being treated as a "death investigation," as police wait for identification of the remains found in a heavily wooded area of Albemarle County that is home to horse farms.

Morrogh announced Matthew is also charged with attempted capital murder and sexual penetration with an object against the victim's will in the Fairfax case. 

Matthew has already been charged with abduction with intent to defile in the Graham case. The 32-year-old hospital worker was last seen on surveillance video with Graham on the night she disappeared.

Matthew is also forensically linked to the murder of Virginia Tech student Morgan Harrington -- whose body was found in Albemarle County in 2009.

In 2010, authorities announced that a 2005 abduction and sexual assault in Fairfax was forensically linked to the 2009 murder of Harrington, who was last seen in Charlottesville.

The victim in the 2005 attack helped police create a sketch of her attacker.

The similarities between the disappearances of Graham and Harrington are striking. Harrington, from Roanoke, was last seen by her friends as she was leaving a Metallica concert at UVA's John Paul Jones Arena in search of a restroom. When friends later called her cellphone, Harrington said she'd been locked out of the arena and would find a ride home. Witnesses later reported seeing a woman matching Harrington's description walking along a bridge not far from the arena.

Harrington's remains were found Jan. 26, 2010, at Anchorage Farm in Albemarle County, 10 miles outside of Charlottesville and a short distance from where a second set of remains was found Saturday. While police released few details about Harrington's death, her family said in 2010 her murder had been violent, with several bones broken. She had also been raped, they said.

Graham also disappeared after becoming separated from her friends. Surveillance video showed Graham as she walked or ran alone past a bar and a service station, then onto Charlottesville's Downtown Mall. She sent friends a string of text messages, saying she was lost after leaving an off-campus party, according to police. Witnesses later told detectives she was seen with Matthew at a bar.  

Matthew, a hospital worker, had a taxi license at the time Harrington disappeared.

A preliminary hearing is set for Dec. 4 on the charge in the Graham case. In the meantime, Matthew is being held in the Albemarle-Charlottesville Regional Jail.