PROVO — More than 10 years after a Spanish Fork teenager disappeared without a trace, Timmy Brent Olsen was charged Thursday with her murder.

The Utah County Attorney's Office charged Olsen, 28, in the death of Kiplyn Davis, who disappeared from Spanish Fork High School on May 2, 1995.

Olsen, of Spanish Fork, is already charged with several counts of lying to an FBI agent and a federal grand jury in connection with Davis' disappearance. He now also faces a first-degree murder charge, which carries with it a possible sentence of life in prison.

"There has been a real conspiracy of silence among those individuals who have information about Kiplyn, about what happened to her and about where she is," Utah County Attorney Kay Bryson said at a press conference Thursday afternoon.

Bryson said that conspiracy has been breaking down as a result of a grand jury investigation, which in the past year has led to the federal perjury indictments for Olsen and four other men linked to Davis' disappearance.

Two of those men, Garry Blackmore, 25, and Scott Brunson, 28, have pleaded guilty to the federal charges. Olsen and two other suspects, Christopher Neal Jeppson, 28, and David Rucker Leifson, face federal trials.

One or more of those men may also face state charges, Bryson said, and he expects that additional charges will be filed against Olsen, who has been in federal custody since September.

Blackmore, who previously denied discussing Davis' disappearance with a friend, now says the friend confessed to him that he killed the teenage girl. Information released about the case appears to indicate that friend was Olsen.

A month earlier, Brunson agreed to testify against Olsen, saying he created a false alibi for Olsen. Brunson originally told police Olsen was helping him roof a shed the day Davis disappeared.

Federal officials say they have more than 70 witnesses saying Olsen and another man took Davis to a local canyon, where she was raped and killed in May 1995.

"I am surprised that the people we have identified as suspects have been able to hold the secret as long as they have," Bryson said. "I think that was accomplished in part by threats and intimidation."

Bryson declined to discuss in detail the evidence against Olsen, saying only that transcripts from the grand jury and investigative reports provided the Utah County Attorney's Office with the grounds for filing the first-degree murder charge in 4th District Court.

The county attorney's office plans to obtain a warrant for Olsen's arrest "in the next few days" and continue having him held in federal custody until the completion of his perjury trial, Bryson said.

The Utah County Attorney's Office estimates it will begin prosecuting the murder case this summer. In the meantime, the investigation will continue, Bryson said.

"The grand jury is going to continue its work, and we're going to have even more evidence and new information concerning Kiplyn's death and disappearance than we have today," he said.

Bryson called the fact that Davis' body has never been found "a complicating factor" but said it's not detrimental to the case against Olsen. He also said law enforcement officials believe they have an idea where to find the girl's body.

"It's just a matter of time, perhaps just a matter of waiting for the spring," Bryson said. "We're closer to finding Kiplyn than we've ever been."

Finding Kiplyn has been the Davis family's goal since she went missing nearly 11 years ago, her father said.

"I think the mountain's coming down," Richard Davis said. "I think we're getting closer and closer. . . . Pretty soon someone's going to decide it's time to tell us where she is. I feel like we're getting close."

Spanish Fork Police Chief Dee Rosenbaum said the murder charge being filed against Olsen is a "significant step" in bringing some degree of closure to the Davis family.

"Richard and Tamara Davis grew up in the community of Spanish Fork, as well as did many of us who have been involved in investigating this case," Rosenbaum said. "We grew up with these people. We know them. We are a close community. They have gone through something that no parents should ever have to go through — that no one should have to go through."