LONDON — Britain was awash in a new surge of outrage over the phone hacking scandal on Thursday as news emerged that Scotland Yard had added to the list of probable victims a woman whose 8-year-old daughter was murdered by a repeat sex offender in 2000.

The tabloid at the center of the scandal, The News of the World, aggressively championed the campaign of the grieving mother, Sara Payne, for a law warning parents if child sex offenders lived nearby. Mrs. Payne had written warmly of the paper in its final issue, calling it “an old friend.”

A statement released on behalf of Mrs. Payne by the Phoenix Foundation, a children’s charity she founded, described her as devastated and disappointed.

“Today is a very sad dark day for us,” the charity added in a posting on Facebook. “Our faith in good people has taken a real battering.” Other postings noted that she was struggling in light of the July 1 anniversary of her daughter’s abduction and from the effects of a stroke she suffered 19 months ago, which paralyzed her left side.