Kate Gibson, executive director of the WISH Drop-In Center Society in Vancouver, British Columbia, a group that counsels and assists women forced into prostitution, said police should have known a killer was targeting call girls when they found the body of Jill Lyons, 45, in a New Westminster apartment Aug. 12, the Canadian Broadcasting Corp. reported Tuesday.
Police have said the cause of death was unknown and they were awaiting a toxicology report to help make a determination.
A second woman, Karen Nabors, 48, was found dead in the same building two weeks later.
Both women worked in the sex trade, Gibson said.
"In Vancouver, we've already seen this happen," she said. "Not stepping up, not dealing with this. And could they have prevented a second death? Maybe they could have."
Police issued a warning to female escorts to be extra vigilant after finding Nabors dead.