Laci Peterson's Mom: Killer Will Pay

April 21 -- Laci Peterson's family now knows what happened to their daughter and her unborn child, and the suspect in her death — her husband Scott — is in custody, but they say they will never have true closure.

Hours after Scott Peterson pleaded not guilty to two counts of capital murder, his in-laws held a news conference to thank the media, their community, law enforcement officials and the nation for support in the search for Laci, who was nearly eight months pregnant when she disappeared Christmas Eve. Her remains, and those of her unborn child, washed ashore last week on a San Francisco Bay shore.

Laci's family made a point not to mention her husband by name. But her weeping mother vowed to seek justice for Laci and the unborn son she had named Connor.

"Soon after Laci went missing, I made a promise to her that if she's been harmed, we will seek justice for her and Connor and make sure that that person responsible for their deaths will be punished," said Sharon Rocha.

"I can only hope that the sound of Laci's voice begging for her life, and begging for the life of her unborn child, is heard over and over and over again in the mind of that person every day for the rest of his life."

Her voice quivering, Rocha said: "I love my daughter so much. I miss her every minute of every day. My heart aches for her and Connor. Without them, there's a huge void in my life."

Laci's family said they did not want to mention Scott specifically because they did not want to jeopardize the prosecution's case and preferred to focus on their loss — and Laci's memory.

"We're not going to do anything that will jeopardize the work of so many men and women," said Ron Grantski, Laci's stepfather. "We understand that many of you will be asking us for interviews over the next few days. But please understand, we have two things ahead of us: May 4 is Laci's, birthday and we have to start thinking about funeral services."

The birthday would have been Laci's 28th.