Why Police Believe Serial Killer Billy Mansfield Had More Victims

On June 23, 2026, Hernando County, Fla., residents learned there might be more victims of the serial killer Billy Mansfield just as the latest search came to an end without any remains recovered.

For a few days, it seemed as if investigators from the FBI and the Hernando County Sheriff’s Office might find more to add to Billy’s case file. Billy, 70, is serving multiple and concurrent life sentences for five murders, but police have said Billy suggested that there “might be more bodies.”

The search was launched based on Billy’s statements to investigators. The Hernando County sheriff, Al Nienhuis, had said his team was “cautiously optimistic.”

“He may be totally lying to us,” Nienhuis said during the search. “He may be delusional.” 

The case stands out not just because of the heinous crimes, but because of Billy’s family history: His father, William Mansfield Sr., was indicted in 1980 on over 40 charges related to child molestation. William would go on to serve 10 years of a 30-year sentence.

Billy’s legal history began much like his father’s in Michigan, where he was born and raised. Both father and son were convicted of disorderly conduct, and when he was 18, Billy was accused of sexually assaulting two girls almost 30 years after William was acquitted of sexual assault charges. Like his father, Billy was acquitted by a jury.

The Mansfield family moved to Florida after this, but Billy traveled between Michigan and Florida during this time. In Michigan, Billy was accused of sexual assault again in 1976, but this time, he pleaded guilty to a lesser charge of sexual misconduct and was sentenced to six months in prison. He returned to jail there a year later, once more on charges of sex crimes, but now facing a life sentence. However, his sentence was reduced after he agreed to testify against another prisoner who told Billy that he’d murdered a crossing guard.

In Florida, he was accused of physically assaulting an 18-year-old girl.

Billy’s criminal record took an even darker turn after he and his brother turned up in California, where Billy was charged with killing 29-year-old René Saling. His murder charge there prompted more scrutiny over his time in Florida, and in 1981, the Hernando County Sheriff’s Office began a search of Billy of his family’s property in Spring Hill, Fla. They were looking for the body of 21-year-old Sandra Jean Graham, who disappeared in Tampa, Fla., the year before.

Investigators recovered another body of an unknown girl (initially estimated to be 13 years old) on the Mansfield property on March 17. They then found a second body, quickly identified as 15-year-old Elaine Zeigler from Ohio who went missing while on vacation with her family in 1975. Two more sets of remains were found weeks later, one of which belonged to Graham and the other of which belonged to an additional, unidentified woman estimated at the time to be between 22 and 30.

All this occurred while Billy was in jail in Santa Cruz, Calif., preparing to face trial for Saling’s murder. He was convicted and sentenced the following year in that case, and in August 1982, he pleaded guilty in Florida to killing Graham, Zeigler and the two Jane Does. He is still serving those sentences in California.

For years, there was no movement in Billy’s case. It would take police more than four decades to confirm, using DNA technology, that the slightly older of the Jane Does was 16-year-old Theresa Fillingim, and investigators are still working on identifying the other. However, investigators had always believed Billy had more bodies buried in Florida.

Then, in 2024, Billy confessed to kidnapping and killing a sixth woman, 18-year-old Carol Ann Barrett, in 1980. Because he was already serving multiple life sentences, prosecutors did not pursue criminal charges against him.

Investigators continued to talk to Billy, which led to the 2026 search, when investigators from the Hernando County Sheriff’s Office began a dig on June 22, 2026, based on his statements suggesting there may be more remains in Hernando County. 

Dogs, forensic specialists, the FBI and other local agencies joined the search. The dogs, trained to sniff out archeological cadavers, appeared to indicate that there were traces in the search area.

“There was enough to give them encouragement to dig,” Nienhuis said during the search.

On June 23, authorities ended their search. A police spokesman tells A&E Crime + Investigation they are not planning to continue, and even if they had, they would not seek additional charges. 

“It’s worth a shot,” State Attorney Bill Gladson said as the search began. “We owe it to the victims.”