"I'd like to be able to move on from ever thinking of him again," said Guttenberg, whose 14-year-old daughter died in the 2018 school shooting in Florida.
"Adults who use their access to children for their own sexual gratification...are both a danger and a disgrace," said FBI's Joseph Bonavolonta.
The former nursing student entered a synagogue on the last day of Passover in 2019 with a semiautomatic rifle, killing one person and injuring three others.
"We hope it brings a measure of justice and closure to the victims, their families, friends and the wider community," the district attorney's office said.
Florida jurors on Tuesday found John Jonchuck, 29, guilty of first-degree murder over the death of his daughter Phoebe in 2015.
Antonio White, 54, was sentenced to life in prison on Friday for raping a woman in his car in 2007.
Don't get banged up in the Philippines.
At one prison, David Richardson said he made the warden hand out toilet paper.
For the first time, defendants in Delaware have been convicted and sentenced under the federal "cyberstalking resulting in death" statute.
Holtzclaw found his victims while patrolling a low-income neighborhood.