But investigators looking for Laci Peterson after she vanished focused on her husband from the start, searching his home, monitoring his movements, and trying to debunk his alibi - that he was fishing at the Berkeley Marina when his pregnant wife was last seen alive.
Scott Peterson, 30, is now in custody, likely facing double murder charges, after DNA tests identified bodies found about three miles from the marina as 27-year-old Laci Peterson and her infant son, his umbilical cord still attached.
CBS News Analyst Andrew Cohen says that since Peterson probably faces capital murder charges, there is no chance that he will be released on bail before trial. That means the case might get into gear sooner rather than later with a preliminary, probable cause hearing -- or mini-trial, if you will -- occurring even before the end of the year.
This could be a death penalty case because police are considering it a double homicide -- that of Laci and the newborn. That designation offers a tactical advantage for prosecutors because it allows them to look for and get trial jurors who might be more willing to lean toward the government's view of the evidence, Cohen says.
"Clearly investigators had evidence against Scott Peterson before the bodies of his wife and unborn child were found and just as clearly the discovery of those bodies fit into the prosecution's theory of the case as that theory aims toward Scott Peterson," Cohen adds.
Since her disappearance on Christmas Eve, police had pursued nearly 10,000 tips, and looked at parolees and convicted sex offenders as possible suspects, but they kept returning to one person: Scott Peterson.
"We haven't been able to eliminate him for a long while," Police Chief Roy Wasden said. "You look to eliminate possibilities and that's what we kept doing and Scott could just never be eliminated."
The fact that no credible information was ever received on tip lines - even when the award was boosted to $500,000 - also kept investigators focused on Scott.
"Had anyone known about where Laci was, had any information about where she was and if she was alive, we would have heard about it," Wasden said.
On Friday, hours before the DNA test results were announced, plainclothes agents who had been tracking Scott Peterson with phone taps and vehicle sensors pulled him over in the San Diego area, where his parents live, and arrested him.
Attorney General Bill Lockyer said they feared Scott Peterson might try to flee, due to San Diego's proximity to Mexico. His dark hair had been bleached blond and he had a beard.
He was booked into the Stanislaus County jail late Friday and is expected to be arraigned Monday or Tuesday on two counts of capital murder. District Attorney Jim Brazelton didn't say if he would seek the death penalty.
Peterson's attorney, Kirk McAllister, did not return telephone calls seeking comment Saturday.
Authorities have refused to speculate about a motive.
While police refuse to discuss their evidence against Scott Peterson, Lockyer has described the case as a "slam dunk," reports CBS News Correspondent John Blackstone.
Outside Laci's home in Modesto a shrine of flowers and Teddy bears has been growing since word came that the lost mother and child had been found, Blackstone says.
Scott and Laci met in San Luis Obispo, where he worked three jobs to put himself through college.
"The moment he was with Laci, they just beamed at each other," his mother, Jackie Peterson, told the Modesto Bee. "No one else ever made my son smile like that. They did everything right."
She refused to comment on her son's arrest. "I'm not talking until they resolve this whole thing," she told the Contra Costa Times.
The couple married in 1997 and ran a cafe in San Luis Obispo. They sold the place two years ago and moved to Modesto to be closer to her family.
After Laci became pregnant, Scott "put a lot of hours into making that baby room just right," family friend Guy Miligi told the Modesto Bee. "He was real excited about having his first child. He talked about that all the time."
For weeks, the couple's family and friends staunchly stood behind Scott Peterson.
Laci's brother, Brent Rocha, said in January that Scott loved his wife too much to ever harm her. Her friends said he was a devoted husband.
"Scott is devastated," Laci's stepfather, Ron Grantski, said in January. "I know what we're going through, but he's got double. The press is questioning him, but all he wants to do is find his wife."
Days later, Laci Peterson's family severed ties with him after learning he had an affair with another woman. They publicly called on him to help police, who labeled him "uncooperative."
After the rift with his in-laws, Scott Peterson launched his own search effort, distributing fliers in Los Angeles while searchers looked in San Francisco Bay and near Modesto.
Many of his Modesto friends began to shun him. His fellow golfers at the Del Rio Country Club quietly bought out his membership for an estimated $25,000 in cash.
He eventually moved to San Diego, his hometown.
There, he was aware of the surveillance, waved at detectives and was "being kind of a smart aleck" before Friday, said Lockyer.
Wasden sought an arrest warrant Thursday, a day before the confirmation of the identities of the bodies, in part because he feared Peterson might flee to Mexico, which forbids the extradition of anyone who faces the death penalty.
"That was a concern," Lockyer spokesman Nathan Barankin said Saturday. "While we've improved our relationship with Mexico, extraditions, death penalty or not, can be very troublesome, expensive and tiresome."