The final unidentified victim of serial killer Keith Hunter Jesperson, infamously known as the "Happy Face Killer," has been identified as Lydia Jane Wade McWhorter, Riverside County prosecutors announced Thursday. Her remains were discovered in 1992, and the mystery surrounding her identity has persisted for 34 years until recent advancements in DNA technology and genetic genealogy led to the breakthrough.

McWhorter's remains were found on August 30, 1992, along Highway 95, approximately seven miles north of Blythe, California. For decades, investigators referred to her only as “Claudia.” Jesperson, who earned his moniker for allegedly sending taunting letters adorned with smiley faces to authorities and the media, confessed to her murder.

According to investigators, Jesperson met McWhorter while working as a long-haul truck driver. She reportedly wanted to travel to the Los Angeles area, but Jesperson, who was heading towards Arizona, took her to Cabazon instead. She continued to travel with him until they reached the Indio/Coachella Burns Brothers rest stop. Jesperson claimed an argument over money escalated into her death inside his truck. He then transported her body to Blythe and abandoned it.

Prior to her identification, investigators created several sketches of what McWhorter may have looked like. She was described as being between 20 and 30 years old, with shaggy blonde hair and dressed in tight clothing. She was reportedly wearing a T-shirt featuring a motorcycle print and had a tattoo of two small dots on the left side of her right thumb.

McWhorter had disappeared from Texas in the 1990s, leaving her sisters uncertain of her fate for decades. The Riverside County Regional Cold Case Homicide Team appealed for information in 2024, which prompted new leads. Investigators initially found paternal relatives through DNA analysis but needed a maternal connection to confirm the identification. A subsequent lead provided detectives with access to a direct maternal relative, and a DNA sample collected recently confirmed the match.

"When people take the time to share information, submit a tip or simply pay attention to what is happening in their community, it can make a real difference," said Billy Hester, Supervising Investigator of the Cold Case Unit. "You may not know where a piece of information will lead, but our investigators will follow it. Most importantly, I hope this will finally bring closure to Lydia’s family."

The District Attorney’s Office is now collaborating with McWhorter's family regarding her final resting place. Her identification marks the resolution of the final case associated with the murders for which Jesperson has been convicted.

Jesperson has eight confirmed victims killed between 1990 and 1995 across Washington, Oregon, California, Florida, Nebraska, and Wyoming. He is currently serving multiple life sentences in Oregon. At one point, he claimed to have committed as many as 160 murders.