A 71-year-old woman is standing trial in the UK, accused of murdering her 84-year-old husband in their home with a kitchen knife — a death she insists was a tragic accident, the result of a slip and fall that prosecutors and medical experts say simply does not add up.

Daryl Berman is charged with the murder of her husband, David Berman, who died in March after being found face down on the kitchen floor with a knife embedded in his chest near his right armpit. The death was initially ruled an accident, a decision that led police to leave David Berman’s body inside the couple’s home while arrangements were made for an undertaker to collect it. That ruling would later be revisited after investigators allegedly uncovered evidence pointing to his wife’s involvement.

One detail has drawn particular attention in court: a calendar entry written by Daryl Berman on the very day her husband died.

“It has got ‘bye bye’ and it has got two kisses, and it has got a heart,” she testified on Monday, according to the Manchester Evening News. “I put it on at the end of the day when everybody had gone and I was ready to go up to bed.”

In emotional testimony, Berman told the jury she lay down next to her husband’s body multiple times while waiting for it to be removed from the home.

“I lay down next to David,” she said, crying. “I kissed him and I stroked his arm. I did it quite a few times.”

According to statements she allegedly gave police, the incident unfolded as she was eating a chicken salad sandwich on March 13. She told investigators she had a knife on a tray and that David offered to carry the tray into the kitchen for her. Moments later, she claimed, she heard what sounded like a stumble.

“It was like a stumble or a slip,” she told the court. “Then I heard another noise. It was like a groan. I jumped up and screamed and ran in.”

Berman said she found her husband lying face down, making what she described as a “gurgling” sound. She told police there was a large amount of blood on the floor — so much that she initially did not recognize it for what it was.

“I sort of looked down, moved his head a bit, and I thought ‘what on earth is all this gravy? We don’t have gravy,’” she allegedly recalled during one interview. “It was the amount of blood. I’ve never seen anything like it in my life.”

She said she called emergency services, with a dispatcher instructing her to perform compressions and asking where her husband was bleeding from.

“I said, ‘I haven’t got the foggiest,’” she told police.

But the accidental explanation has been sharply challenged in court. A medical examiner who performed David Berman’s autopsy testified last week that the scenario described by his wife was implausible. Dr. Philip Lumb told the jury that the combination of the stab wound and a defensive injury found on one of David Berman’s fingers made an accidental fall onto a knife “inconceivable.”

“I think in broad terms, looking at the general population, accidental stab wounds with knives are exceedingly rare,” Lumb said. “I personally have not come across one.”

When asked directly in court whether she killed her husband, Daryl Berman was unequivocal.

“Absolutely not,” she said.

Prosecutors have not publicly identified a motive for the alleged killing. The case, heavy with unsettling details and unanswered questions, continues this week as the jury weighs whether the death of David Berman was a freak accident — or something far darker concealed within an ordinary domestic moment.