The FBI has completed tests on some of the evidence from suspected serial killer Richard Marc Evonitz and may announce within a week whether he is the man who killed three Spotsylvania County girls in 1996 and 1997.

"Some results on the evidence are trickling in," Donald Thompson, special agent in charge of the FBI's Richmond office, said yesterday. "That's typical of cases where you have a great deal of evidence being examined. We don't want to discuss the findings on any individual analysis until we get a more comprehensive picture."

Thompson said he expects most of the tests to be completed within a week.

A task force of local agents and investigators met at the FBI office in Fredericksburg twice yesterday to discuss the evidence and strategies for pursuing the case, Spotsylvania sheriff's Maj. Howard Smith said.

He would not say whether any of the forensic evidence collected after Evonitz shot and killed himself last month has linked him to the killings of 16-year-old Sofia Silva and sisters Kristin and Kati Lisk.

Sofia vanished from her front porch the afternoon of Sept. 9, 1996. Her body was found Oct. 14, 1996, in a King George County creek. Kristin and Kati disappeared from their front yard on May 1, 1997. Their bodies were found in the South Anna River five days later. Forensic evidence has linked the cases.

Evonitz lived in Massaponax at the time. He took off work early the day Sofia vanished and did not come to work the next day, police said. He called in sick the day the Lisk girls disappeared.

"We're doing a timeline and looking at everywhere he's been, everything he's done, who he's worked with, who he knows, who he's dated," Smith said. "We've been working nonstop."

Meanwhile, Richland County, S.C., Sheriff Leon Lott said authorities there may charge Evonitz's sister, Kristin Weyland of Irmo, S.C., with helping him escape as authorities tried to arrest him in the June 24 abduction and rape of a 15-year-old girl outside Columbia.

Weyland told detectives that she met her brother at a McDonald's in Orangeburg that same day, then checked him into a nearby Days Inn motel room under her name, Lott said.