DNA from Thomas Jefferson's hair delivers compelling new evidence in centuries-old paternity mystery

The book details an effort to analyze strands of hair linked to Jefferson, including hair discovered between the pages of an unpublished manuscript associated with him.

Using those genetic comparisons, researchers modeled competing paternity scenarios involving Jefferson, plus his brother Randolph and Randolph's sons.

The analysis found the odds that Jefferson fathered neither Madison Hemings nor Eston Hemings were less than one in 1,000.

In a statement, the Thomas Jefferson Foundation said the findings reinforce, rather than rewrite, the historical record.

"The study doesn't change what we know about Thomas Jefferson, Sally Hemings, their children or their world," the foundation said. "But it offers occasion to reflect on how we came to know it, and why we share that knowledge."

Fox News Digital reached out to the Thomas Jefferson Foundation for further comment.

"This should close the case with a lock," Fought, who was not involved in the study, told Fox News Digital.

Rumors that Jefferson fathered children with Hemings circulated during his lifetime and persisted for generations, Fought said, while a 1998 DNA study largely settled the question for historians.

The 1998 study found a genetic link between a male-line descendant of Hemings' son Eston and the Jefferson male line.

Fought said skeptics continued to advance alternative theories, including that Jefferson's brother, Randolph, could have been the father of Hemings' children - an explanation she said the new evidence rules out.

"This evidence says that's not true either. It was definitely [Thomas] Jefferson," Fought said.

Beyond resolving questions about the paternity of Hemings' children, the expert said the story offers an opportunity to focus on Hemings herself and the choices she faced while she was enslaved at Monticello.

"She's an unbelievably fascinating woman, partly because of the mystery of her as a person," the historian said, noting that not many records of her survive.

Despite her circumstances, Fought said Hemings did what she could to secure a better future for her children.

"And here she was giving birth to his children, and she was one of the most powerless types of people in the country."

Fought said Jefferson's legacy should be viewed in all of its complexity.

"When you study history, you study humanity," she said.

"If you think Jefferson was awesome, you can still keep thinking he's awesome, but he also did this thing," added Fought.

"And you can think what you want to think about that. And that's life."