A Jeffrey Epstein accuser at the heart of his serious charges last year had been known to Florida prosecutors more than 10 years earlier — but was never called before the fallen moneyman got his sweetheart deal, it was claimed Thursday.

As “Minor-Victim 1,” she was the only New York accuser whose allegations were detailed in major charges that the US Attorney’s Office in the Southern District of New York brought against Epstein last year — a sign of how important she had been to the case.

Identified only as Jane Doe, she claimed she was just 14 when she was lured to Epstein’s Upper East Side mansion in 2002, and was sexually assaulted “countless times” over three years, according to court docs.

Now ABC News claims she had also cooperated with Florida prosecutors in a 2008 investigation that ended in Epstein receiving a controversial sweetheart deal and getting just 13 months in jail — most of which he served from his private office.

She was questioned by the FBI and subpoenaed for testimony by federal prosecutors — but never made it before a grand jury, because Epstein reached his then-secret deal by copping to lesser charges, ABC News said, citing court documents and multiple sources familiar with the events.

The claims further anger those involved in Epstein’s case who believe there was always enough evidence to throw away the key on the moneyman, who had been accused of abusing young girls for years before he hanged himself in his Manhattan lockup in August.

“The potential was always there,” Spencer Kuvin, an attorney who represented three of Epstein’s alleged victims in the Florida case, told ABC.

“[The government] shut this thing down and pled this thing out before going through and talking to probably more than half of the women that were involved in this whole thing. Had they conducted a full investigation and taken their time, this would’ve been a whole different story.”

The accuser, now a 31-year-old mother, has filed a civil lawsuit against Epstein’s estate, saying his abuse “has forever scarred her and altered her life.”

An attorney representing the woman declined to comment to ABC.

A spokesperson for the US Attorney’s Office in the Southern District of New York also declined to comment to the network.

Marie Villafaña, the former Florida federal prosecutor who led the initial investigation, is “prohibited” from discussing it, said her attorney, Ty Kelly.

However, if the Department of Justice “were to waive that privilege, she believes it would provide a fuller and more accurate picture of how she handled this matter and how she advocated for victims at every turn,” Kelly told ABC.