serial killer
Todd Kohlhepp, a registered sex offender who has been arrested in connection with the kidnapping of Kala Brown and Charles David Carver is shown in this booking photo provided in Spartanburg, South Carolina, Nov. 3, 2016. Reuters

A South Carolina man, Todd Kohlhepp, who was convicted of killing seven people earlier this year, said Saturday there are more victims whose remains have not been discovered yet.

In an eight-page letter to Spartanburg Herald-Journal, Kohlhepp wrote that he attempted to tell investigators and informed the FBI, however, "it was blown off."

"At this point, I really don't see reason to give numbers or locations," he wrote.

Don Wood, chief division counsel with the FBI's Columbia office, stated that the agency has a pending investigation but declined to comment specifically on what the FBI is doing.

Kohlhepp, 46, pleaded guilty in May to seven counts of murder for killings that took place over more than ten years, all while he also ran a real estate business. He was sentenced to life in prison.

Kohlhepp was arrested after police searching for a missing couple discovered a woman "chained like a dog" inside a shipping container and also found a body buried in a shallow grave in November 2016. The woman named Kala Brown, had been raped and locked inside the storage container for over two months after Kohlhepp shot and killed her boyfriend, authorities said. Charles David Carter, 32, who went with her for a cleaning job on Kohlhepp's property, was the last of the seven murder victims.

In addition to Carter, Kohlhepp also pleaded guilty in May to killing husband-and-wife Johnny and Meagan Coxie in December 2015, as well as four other people at a local motorcycle shop in 2003. Kohlhepp is currently serving seven consecutive life terms along with 60 years on kidnapping, sexual assault and other charges. The serial killer is not eligible for parole.

At the time of Kohlhepp's sentencing, his attorney told the court that there were no other victims. But in his letter to the Herald-Journal, Kohlhepp wrote that his murder trail, "leaves the state and leaves the country."

After being rescued, Brown spoke publicly about her ordeal. On the "Dr. Phil" show in February 2017, she accused Kohlhepp of raping her regularly during her captivity, said he bragged about how good he was at killing, and also allegedly claimed his victims numbered nearly 100.

Brown said she did what she had to do in order to survive.

"He told me as long as I served my purpose, I was safe," Brown said during the interview.

Kohlhepp's mother Regina Tague, in an emotional interview with "48 Hours," insisted her son is "not a monster" after his arrest in November.

"I want [Brown] to know how sorry I am," Tague told "48 Hours."

"And I think Todd is too. Because he didn't wanna hurt her, he just didn't know what to do," Tague said, CBS News reported.

Kohlhepp reportedly moved to South Carolina in 2001, shortly after he served 14 years in prison after pleading guilty to a kidnapping charge in Arizona. Authorities claimed that in Arizona, the then 15-year-old Kohlhepp forced a 14-year-old neighbor at gunpoint, allegedly tied her up and raped her.

Anderson Police Capt. Mike Walters said he does not believe Kohlhepp is associated to any more local cases, but suspects that he might have victims out of state.

"I'm sure there are more. I’m just thinking they’re more likely in Florida or elsewhere," Walters said, Fox News reported. "People like him, they want the cops to get the notoriety. They’re always going to throw bait out there often to keep their name out there."

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