A serial killer received a fourth life sentence for the murder of a woman whose body was found in the desert near Blythe in 1992.

Keith Hunter Jesperson, known as "The Happy Face Killer," was sentenced Friday in Riverside after pleading guilty to killing the woman he picked up in the Cajon Pass.

The 54-year-old Jesperson has also admitted to killings in Washington, Wyoming, Oregon and Northern California.

Jesperson is known as the "Happy Face Killer" for drawing happy faces in letters in which he boasted of his crimes to prosecutors and an Oregon newspaper.