Want $250,000? Come up with a tip that springs Scott Peterson from San Quentin.

The death row inmate's family is offering the reward for "specific information" leading to his exoneration.

The reward was announced last week on a family Web site, www.scottpetersonappeal.org, which advocates the former fertilizer salesman's innocence in the 2002 disappearance of his wife, Laci, who was nearly eight months pregnant with their son.

According to the site, the money will be paid to anyone who produces "specific information leading to an arrest and conviction for the abduction and murder of Laci and Conner Peterson, or for specific information leading to the exoneration and release of Scott Peterson."

The 33-year-old from Modesto, Calif., was sentenced to death last year after a six-month-long trial in Redwood City.

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The Web site touts a second reward for information leading to the recovery of a Croton watch "Laci is believed to have been wearing the day she went missing." During the trial, Peterson's defense hinted that a Croton watch pawned the week after Laci Peterson's disappearance indicated another culprit.

Birgit Fladager, one of three prosecutors to try the case, said Monday that she had "breezed through" the Web site and found it "a rather desperate attempt to gain attention."

"It's an extraordinary amount of money that they know they'll never be called upon to pay," said Fladager, a chief deputy district attorney in Stanislaus County.

She said authorities in Modesto still receive and investigate tips about the murders.

"Primarily, they are from people who really have no connection to reality," she said.

She said that although thousands of tips poured into police during the high-profile investigation and trial, few proved relevant.

"There hasn't been anything substantive since Amber Frey's call," Fladager said of Peterson's mistress, who phoned police the week after Laci Peterson's disappearance.

A call to Peterson's lawyer, Mark Geragos, was not immediately returned.