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.

Bill and Linda Stevenson smiling.
Linda Stevenson, 64, was found dead on the living room floor of the home she shared with her husband Bill Sunday night.Facebook

“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.

Bill Stevenson, Linda Stevenson, and Christina.
Bill Stevenson (center), Linda Stevenson (left), and Christina Vettori (right), who said the death was being investigated as a “murder.”Facebook
Jill Biden (circled) and Bill Stevenson (circled) with others in a group photo.
Jill Biden (circled) and Bill Stevenson (circled) were married from 1970 to 1975.

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.

Dr. Jill Biden smiling and shaking hands, wearing a black blazer with a floral brooch, holding a drink.
Jill Biden was married to her 77-year-old ex-hubby for five years before splitting in 1974 and divorcing a year later.WWD via Getty Images
Joe Biden and First Lady Jill Biden holding hands at the White House with a Marine saluting in the background.
Jill and Joe Biden married in 1977 and have publicly said they met on a blind date two years prior.Jim LoScalzo – Pool via CNP

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

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.