In NY jogger killing, a DNA sample but no one to match it to
{{#rendered}} {{/rendered}}Detectives hunting the person who strangled a New York City runner were encouraged after recovering a DNA profile of her probable killer.
A month later, their optimism has waned.
The DNA profile worked up from the genetic material found beneath Karina Vetrano's fingernails and elsewhere doesn't match profiles in state or federal databases.
{{#rendered}} {{/rendered}}That means the sample now joins 56,530 others on file with in New York that have been lifted from crime scenes but not linked to a person.
DNA experts say this scenario is not uncommon.
They say that when a DNA profile doesn't hit, investigators must use old-fashioned detective work to solve their case.
{{#rendered}} {{/rendered}}Police in New York say they're working around the DNA issue by checking video, interviewing runners and pursuing leads.