Police Looking to Identify 6th Victim of 'Happy Face Killer' After 20 Years

— -- Police are looking for the public's help in identifying the sixth victim believed to have been killed by the Happy Face murderer, authorities said.

The Palm Beach County Sheriff's Office said the victim was likely from Florida or Nevada and named Suzy, Suzanne or Susan.

The killer, Keith Hunter Jesperson, claimed that he killed the woman but did not provide accurate details of the killing, in the Florida Panhandle, police said.

In 2014, the county's forensic imaging specialist Paul Moody worked with Jesperson to come up with a sketch of the victim.

They then used that, superimposed on the skull found with the remains to generate a 3-D image of the woman.

The sheriff's office also released a video in which they interviewed investigators on the case.

"The killer says this is her," the caption on the video reads. "Now, we need your help to identify this Jane Doe and bring closure to the family and friends connected to her."

The victim's body was found decomposed over 21 years ago, police said.

Jesperson, who is serving life in prison, killed eight women from 1990-1995.

The mystery victim is believed to be the sixth.

"You could help solve a mystery that has haunted my investigators for over 21 years," police said.

Palm Beach County has no connection to the case aside from the fact that Moody's services are being used by the Florida Division of Law Enforcement in helping to determine the identity of the victim.

Jesperson became known as the "Happy Face Killer" for smiley faces he would leave on notes at crime scenes.

His murderous spree went unnoticed until he turned himself in.

“We are secondary crime victims. We carry that shame and we want to remove that,” his daughter Melissa Moore told ABC News. “I feel in a sense I am related to my father, but I didn’t cause the pain. But knowing that my father caused some pain causes me pain.”