WASHINGTON -- District of Columbia investigators on Tuesday declared Chandra Levy a homicide victim, although they do not how the Modesto woman was killed.
Medical Examiner Jonathan L. Arden reporters that there was insufficient evidence to conclusively determine the cause of death.
"However, the circumstances of her disappearance and her body's recovery are indicative that she died from the acts of another person," Arden said at a crowded news conference.
The 24-year-old Levy's remains were discovered a week ago at the base of a steep slope at Rock Creek Park. Investigators admitted that they remain baffled as to whether she was killed where her body was found, or if it was moved there.
Authorities recovered Levy's skull and most of the rest of her remains. Arden would not characterize the condition of what he described as "skeletonized" bones, nor would he say which bones were missing.
A Smithsonian Institution forensic anthropologist assisted Arden in examining the remains. But the body's discovery came too late.
Strangulation, Arden said as an example, is usually a determination made only when an intact body is found.
"On occasion, that can be ascertained from bones alone," Arden said. "In this instance, we could not make such a call."
He said Levy's remains were in a condition consistent with her having died about a year ago.
He acknowledged that how she died might be forever a mystery. "There's less to work with here than I'd like," Arden said.
The medical examiner said there was no way to determine whether Levy was pregnant.
Arden would not provide details on how and when the remains will be released to the family. If there are DNA tests still to be conducted, the FBI will do them.
The FBI laboratory also will examine other evidence from the site. These items include a University of Southern California shirt, a sports bra, an empty portable cassette player and headset, and shoes not made for serious running.
Police had expected Arden's conclusions almost from the moment that Levy's remains were discovered.
"We will solve this case, I guarantee you that," Police Chief Charles Ramsey vowed.
"We have a lot of evidence we collected from the scene that we need to go over," he added, and "we'll speak to anybody who we think we need to further this investigation, anyone at all."
Attorney Mark Geragos said he would "welcome" a request for another interview with his client, Ceres Rep. Gary Condit, who has not denied reports that he admitted to police that he had an affair with Levy. She had been an intern with the U.S. Bureau of Prisons.
Condit has denied having anything to do with Levy's disappearance. Geragos repeated his assertion that Condit will be exonerated.
"I think I was more hopeful the medical examiner would come up with some evidence," Geragos said Tuesday night on CNN's "Larry King Live." But he asserted that the information "points to a stranger, that there was a predator in the park."
Police say they will reinterview Ingmar Guandique, a 20-year-old man who is serving a 10-year federal prison sentence for assaulting two female joggers in Rock Creek Park. One of the assaults occurred two weeks after Levy disappeared on May 1, 2001.
Executive Assistant Police Chief Terrance Gainer said investigators still are trying to trace Levy's four-mile path from her apartment to the site in the park where her remains were found. "Either she ran up there, walked up there or was taken up there," he said.
One possibility is that Levy took a taxi, Gainer said. Investigators previously talked with cab drivers who worked the day that police believe she disappeared, but they have not reviewed driver logs, Gainer said.
Levy's remains were discovered by a man and his dog looking for turtles that abound in the park. The man was walking at the side of Broad Branch Road, a curving and shaded street on the park's western border next to a well-landscaped neighborhood of $750,000 homes.
The dog crossed Broad Branch and sniffed out the remains later identified as Levy's.
The remains were about 125 yards across the creek and away from the road, beyond the 100-yard range that police searched in July. They were beneath brush and leaves at the base of what Ramsey previously called a "cliff."
The nearest footpath is the rugged Western Ridge Trail, about 100 feet higher than where Levy's remains were found.
The Associated Press contributed to this report.