Anyone who may have information about what happened to Martha Morrison is asked to call the Clark County Sheriff’s Office Cold Case Unit at 360-397-2036 or email coldcase@clark.wa.gov.

Nikki Costa asked that anyone related to a missing person should go to the National Missing and Unidentified Persons System, findthemissing.org, to make sure that their loved one is in that database. Agencies with unidentified remains run their findings through that system to positively identify the remains and solve missing persons cases.

For eight years, Nikki Costa has been chasing leads, following hunches and asking for help from experts across the country to put a decades-old mystery to rest. Ever since she became the operations manager at the Clark County Medical Examiner’s Office, Costa has worked relentlessly to put a name to the remains of an unidentified woman whose body was found in Dole Valley in October 1974.

On Monday, she finally delivered the news she’s been working so hard to confirm: The remains have been positively identified as Martha Marie Morrison.

“I’m nothing if not persistent,” she said. “There’s nothing about this that was simple, and obviously if you take no for an answer, then you’re done. I’m not really that kind of person.”