SAN DIEGO -- Fliers have been posted in Rosa Lisowski's neighborhood for more than three weeks.

Lisowski was last seen dropping off her son at Barnard Elementary School, police said.

Many people feel that hope for her safe return has dimmed.

"In my heart, I know she's gone. I've made numerous pleas to give back her body so we can have closure, so she'll be buried properly," said Lisowski's friend, Heather Peterson.

Police attention has focused on Henry Lisowski, Rosa's estranged husband who lives in Ocean Beach.

Search warrants were levied on his home, his car and his boat.

The couple had been married for eight years but maintained separate residences, according to authorities.

There were many disputes, those close to the couple said, including the validity of a premarital agreement and arguments over employment, education, and income as child support issues were being decided.

Some close to the couple said there were allegations of poor parental care and nutrition for the couple's sons.

Police said a certificate that showed Henry Lisowski had completed a six-week high-conflict intervention program was found.

A fundraiser is planned for the children on Saturday at a Loma Portal car wash.