The 64-year-old woman married to Jill Biden’s ex-husband was found dead in her Delaware home after law enforcement responded to investigate a domestic dispute late Sunday, authorities said.

Linda Stevenson was found unresponsive on the living room floor of the Oak Hill home she shared with her husband Bill — married to the former first lady between 1970 and 1975 — around 11:15 p.m. when officers responded to a reported family clash, according to the New Castle County Police Department.

Police said she was pronounced dead at the scene despite authorities’ attempts to revive her.

“It’s still a murder investigation,” Stevenson’s grief-stricken daughter, Christina Vettori, told the Daily Mail Tuesday afternoon, before adding, “I would not like to talk at this time.”

Police, who denied claims of a murder probe, are reportedly treating the case as a “death investigation.”

“Detectives from the Division’s Criminal Investigations Unit were notified and responded to the scene to assume the investigation,” police said in a news release.

However, a 911 dispatch recording from the scene, obtained by TMZ, mentioned a “cardiac arrest.”

No charges have been filed in connection to Stevenson’s death and the investigation is ongoing.

Her body has since been turned over to the Delaware Division of Forensic Science, where an autopsy will determine the official cause of death, police said.

Jill Biden was married to her 77-year-old ex-hubby for five years before splitting in 1974 and divorcing a year later. She married former President Joe Biden two years after that.

Bill Stevenson previously accused his ex-wife of having an affair with the Democrat before calling it quits.

He has claimed for years that he and his then-wife grew close to Joe in 1972 while working on his first campaign to represent Delaware in the US Senate.

That same year, tragedy struck when Joe’s first wife, Neilia, and infant daughter were killed in a car crash.

Bill said he first suspected the affair in 1974 — but the Bidens, who have been married since 1977, have publicly said they met on a blind date in 1975, after Joe became a widower and Jill’s first marriage ended.