Police have given a grim update on their probe of the bizarre deaths of Gene Hackman and Betsy Arakawa

Police have made a devastating revelation as part of their probe of the baffling deaths of Hollywood legend Gene Hackman and his wife Betsy Arakawa.

Hollywood icon Gene Hackman was dead for at least nine days before his and wife Betsy Arakawa’s partially “mummified” corpses were discovered, police have revealed.

On Wednesday, maintenance workers arrived at the US$3.8 million (AU$6.1 million) mansion the couple shared in Santa Fe in the US state of New Mexico and made the grisly discovery.

Confusion and speculation have surrounded the tragedy since details began to emerge.

The state of their bodies indicated they had been dead for some time, although there were no signs of forced entry to the home or blunt-force trauma on either Jackman, 95, or Arakawa, 65.

One of the couple’s three dogs was also found dead inside the home.

Gene Hackman and wife Betsy Arakawa at the 60th Annual Golden Globe Awards. Picture: WireImage

Santa Fe County Sheriff deputies arrive at the gated community where actor Gene Hackman and his wife Betsy Arakawa lived. Picture: AP

Today, Santa Fe Sheriff Adan Mendoza revealed the last recorded “event” on Hackman’s pacemaker was on February 17, some nine days before he and Arakawa were found.

“According to the pathologist, I think it’s a good assumption that was his last day of life,” Mr Mendoza told reporters.

The sad revelation comes as the investigation into the bizarre case shifted in focus.

‘Poison’ theory back on the table

Hackman’s family quickly spoke of their suspicions that a carbon monoxide leak might be the cause of death.

But Santa Fe Sheriff’s Office deputies initially ruled out the theory, saying there were no signs of carbon monoxide in the air.

Walking back that rejection overnight, the city’s Fire Department chief Brian Moya said it was still firmly on the table.

Speaking to the Today show, Mr Moya refused to rule out the gas leak theory.

“At the time of the incident, we did not determine anything that was in the house with our meters that was concerning to our guys doing the searches,” he said.

But given Hackman, 95, and Arakawa, 64, had lay dead for several days or “even up to a couple of weeks”, Mr Moya said it couldn’t be entirely ruled out.

It was “possible” the gas had cleared in that stretch of time, he conceded.

Fire investigators returned to the property on Friday to inspect gas lines running to it and outlets inside.

Autopsies raise more questions

Initial results of the autopsies conducted on Hackman and Arakawa have raised more questions than they’ve answered.

It appears unlikely that the couple met with foul play, although police aren’t ruling it out entirely.

There were no clear signs of blunt force trauma on either body.

Actor Gene Hackman with daughters Elizabeth and Leslie at a screening of Superman in 1978. Picture: Getty

Gene Hackman and Marisa Tomei posing with their Oscars in 1993. Picture: AFP

An opened bottle of medication was found on a bench next to Arakawa’s corpse and a number of pills were strewn across it.

However, police have confirmed they did not find a suicide note.

A toxicology report, which could prove key in uncovering the cause of death, might take three months to be released.

A spokesperson for the New Mexico Medical Examiner’s Office told The Sun that a formal report could be up to six weeks away.

‘Suspicious’ circumstances revealed

When police arrived at the time, investigators found Arakawa’s body on the floor in a bathroom.

A room heater was found knocked over on the floor next to her head.

A police report read: “(A deputy) suspected the heater could have fallen in the event the female abruptly fell to the ground.”

One of the couple’s dogs was found dead in a cupboard in the bathroom, close to Arakawa’s corpse.

However two other canines were alive inside the property.

Law enforcement officials outside the home of Gene Hackman and Betsy Arakawa. Picture: AP

Hackman’s body was found on the floor of a room next to the kitchen, with signs he had “suddenly fallen”.

A pair of sunglasses were on the floor next to him alongside a walking stick.

One of the officers who arrived at the scene “advised based on his training and experience that nothing appeared to be ‘out of place”, a report revealed.

The grim discovery was first made by a maintenance worker who arrived at the home on Wednesday.

The man phoned 911 in an emotional state.

Audio of the call depicts him telling an operator he had “found two or one deceased person inside a house”.

Gene Hackman, Wes Anderson and Bill Murray on the set of The Royal Tenenbaums. Picture: Supplied

“Please send somebody really quick,” he said. He could be heard sobbing and saying “damn” over and over again.

It does not appear he knew the couple. When asked for their names, he said he didn’t know.

Despite previous media reports, the man was recorded saying the front door to the mansion was locked.

“[The house] is closed. It’s locked. I can’t go in. But I see that she is lying down on the floor from the window.”

Arakawa was not “awake or alert”.

“No, dude, they’re not moving,” he said. “Just send somebody out here really quick.”

Gene Hackman during the filming of the thriller Target in 1985. Picture: AFP

TMZ reported the couple hadn’t been seen around their neighbourhood for at least two weeks.

The initial police report noted that the circumstances were “suspicious” and warranted a wide-ranging investigation.

There was no sign of forced entry to the property.

‘Frail’: Last sighting of couple

The last public sighting of Hackman was in March 2024.

He and Arakawa were photographed leaving a restaurant in Santa Fe after a dinner to celebrate his birthday.

Hackman appeared somewhat frail. He walked with the aid of a cane and held his wife’s arm for support.

Police believe the couple had been dead for some time. Picture: Getty

Hackman, pictured after receiving the Cecile B. DeMille Award at the 60th Annual Golden Globe Awards, had more than 100 credits to his name. Picture: AFP

They were also spotted earlier in the day at a local grocery store. The actor bought a cup of coffee and an apple pie, according to TMZ.

Despite his appearance in those photographs, loved ones say the couple had been in good health.

Leslie Hackman told Fox News her father ate well and regularly took yoga and pilates classes with his wife.

While he was elderly, he was in good health.

Arakawa’s death was “very shocking” given her younger age and good health.

“We don’t understand what happened.”