SAN DIEGO - A convicted sex offender charged Wednesday with murdering 17-year-old Chelsea King while raping or attempting to rape her was linked to the crime by DNA from semen found in her clothing, a state Justice Department spokeswoman said.
The break led to the weekend arrest of 30-year-old John Albert Gardner III as thousands of people still held out hope that an extensive search would find the teen alive even though she had not been seen since last Thursday.
Prosecutors declined to answer questions about the evidence against Gardner.
However, California Department of Justice spokeswoman Christine Gasparac told The Associated Press Gardner was identified after the semen from clothing found by investigators was run through a national database.
The semen had been detected by the San Diego County crime lab and forwarded to the state, where technicians ran it through the national Combined DNA Index System.
"We were able within two hours to get a match to Gardner, and they were able to make the arrest," Gasparac said.
On Wednesday the 30-year-old Gardner stood silently in court, wrists shackled to his waist and eyes mostly cast downward, showing no emotion as an attorney entered pleas of not guilty in the potential death penalty case.
San Diego County prosecutors charged Gardner with one count of murder with a special circumstance allegation that the crime occurred in the commission of rape or attempted rape.
A second count of assault with intent to commit rape was filed in connection with a December attack on another female.
The victim's parents, Brent and Kelly King, struggled to maintain their composure as they watched the courtroom scene.
District Attorney Bonnie Dumanis said a decision on whether to seek the death penalty would be made later.
"It is a very somber decision," she said.
Gardner's public defender, Michael Popkins, did not address reporters.
Superior Court Judge Joseph Brannigan ordered that Gardner, previously convicted in a 2000 molestation, be held without bail.
The Lake Elsinore man was arrested Sunday as a huge search was under way in a wilderness park in northeastern San Diego, where King's car was found parked Thursday night with her belongings inside.
A body was finally found in a shallow lakeside grave on Tuesday, and authorities said they believed it was King, although formal identification by the coroner was pending.
Dumanis said the case has "rocked San Diego."
Early Wednesday, a spray-painted message was found on the garage at the home of the suspect's mother. It said, "Chelseas blood is on you. Move out." Police did not know who painted it.
Gardner lived at the Rancho Bernardo home in 2000 when he molested a 13-year-old neighbor. The home is down the street from an elementary school and near the park where King was last seen Thursday wearing running clothes.
A piece of paper taped to the front door told visitors to leave.
Thousands of people joined the search and then mourned the Poway High School straight-A student at a candlelight vigil Tuesday night.
Brent King thanked supporters on the lawn of St. Michael's Church in Poway.
"She's my angel forever," he said.
Gardner pleaded guilty in May 2000 to molesting the 13-year-old female neighbor and served five years of a six-year prison term. Prosecutors said he lured the victim to his home with an offer to watch "Patch Adams," a 1998 movie starring Robin Williams.
The girl was beaten before escaping and running to a neighbor.
Gardner "never expressed one scintilla of remorse for his attack upon the victim," despite overwhelming evidence, prosecutors wrote in a sentencing memo.
He had faced a maximum of nearly 11 years in prison under terms of a plea agreement, but prosecutors urged six years.
Dr. Matthew Carroll, a court-appointed psychiatrist who interviewed Gardner, had urged the maximum sentence allowed by law. He said in court documents that Gardner was a "continued danger to underage girls in the community" and an "extremely poor candidate" for treatment.
Dr. Mark Kalish, who shares an office with Carroll, said his colleague was saddened and angered by the news about Gardner, feeling his advice was ignored.
"He didn't want there to be any ambiguity or doubt about his assessment. He laid it out there and he was essentially ignored by the district attorney's office," Kalish said. "How much bigger a red flag could Dr. Carroll have raised?"
Kalish said Carroll was referring calls to him because his colleague, who does work for the county, did not want to discuss the case publicly.
"How are you going to treat someone who says you got the wrong guy?" Kalish said. "This girl ran out of (his) house with her pants down. Come on!"
The district attorney's office has declined to comment on the 2000 case.
Gardner was on parole for three years, until September 2008, state records show.
San Diego police said Gardner also was linked to an assault on a 22-year-old Colorado woman who managed to fend off her attacker on Dec. 27 in Rancho Bernardo Community Park on the northern edge of San Diego, where King's 1994 BMW was found. The second count against Gardner alleges the assault occurred on Dec. 27 but did not specify if it was the incident with the Colorado woman.
San Diego police Capt. Jim Collins declined to describe the evidence connecting Gardner to the December assault but said a swab taken from the victim's elbow did not match Gardner's DNA.
Collins said the victim elbowed the attacker in the face after he demanded money, and he ran off. Collins said the case was treated as an attempted robbery, which was why that DNA wasn't sent for analysis until Monday.
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Associated Press writer Don Thompson in Sacramento contributed to this report.