A Colorado man has confessed to killing 48 people.  Robert Charles Moore who is serving a life sentence for killing a teenage girl admitted to the killings that go back over three decades.

Robert Charles Browne, 53, told authorities the slayings occurred from 1970 until his arrest in 1995. He was in court Thursday to plead guilty to one of those killings — the death of another girl in Colorado in 1987.

Could someone really kill 48 people and get away with it?

“It’s possible he’s exaggerating, but I don’t think you can conduct business assuming he’s exaggerating,” Maketa said. “We’ll continue to pursue leads.”

The other claims include 17 murders in Louisiana, nine in Colorado, seven in Texas, five in Arkansas, three in Mississippi, two each in California, New Mexico and Oklahoma, and one in Washington state — 49 in all, the sheriff said.

If Browne’s claims prove true, he would be one of the most prolific killers in U.S. history.