Podcast:48 Hours Published On: Sun Apr 04 2021 Description: The FBI believes skulls drawn in blood are the number of victims murdered by a prolific serial killer. Inside the FBI search to identify them. "48 Hours" correspondent Peter Van Sant reports.*This program originally aired on May 9, 2020.*See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.