Preliminary autopsy results have not determined how Oscar-winner Gene Hackman and his wife Betsy Arakawa died at their New Mexico home.
However, tests on the pair for carbon monoxide poisoning proved negative.
As authorities continue to investigate their deaths, Hackman's pacemaker has revealed when his "last event" was recorded and several pieces of "important evidence" have been taken from the couple's home.
Here's the latest update.
What happened?
The bodies of Hackman, 95, and Ms Arakawa, 65, were discovered, along with one of the couple's dogs, in their Santa Fe home on Wednesday.
They were found after a concerned maintenance worker called 911 after spotting the bodies through a window.
Ms Arakawa was discovered lying on a bathroom floor next to a space heater. The officer who found her body "suspected the heater could have fallen" in the event that she "abruptly fell to the ground".
Hackman was found in the mudroom, adjacent to the kitchen.
A German Shepherd was also discovered in a bathroom closet, near Ms Arakawa's body.
Authorities initially shared that Ms Arakawa's body "showed obvious signs of death, body decomposition, bloating in her face and mummification in both hands and feet".
Santa Fe County Sheriff Adan Mendoza said no security footage, inside or outside the residence, was found that can help determine a timeline.
The couple was "very private", Sheriff Mendoza said.
What do we know about the time of their deaths?
Hackman likely died nine days before the bodies of him and Ms Arakawa were found.
The last signal from the Oscar-winning actor’s pacemaker was from February 17, according to a pathologist's study.
"It is a good assumption that was his last day of life," Sheriff Mendoza said in a press conference.
"I was advised that a more thorough investigation will be completed."
Sheriff Mendoza also said it was not clear who died first after the two were discovered in separate rooms.
How did they die?
That hasn't been determined yet.
But a pathologist has said the pair tested negative for carbon monoxide poisoning.
Carbon monoxide is a colourless and odourless gas produced from kitchen appliances and other fuel-burning items. When it collects in poorly ventilated homes, it can be fatal.
Sheriff Mendoza also noted there was "no external trauma to either individual". But he said it appears that Hackman and Ms Arakawa suddenly fell to the floor.
Examiners will look to test blood and urine, if available, but could also turn to an oily fluid that typically accumulates in lung and abdominal cavities, and samples of muscle and brain, to help determine the causes of death.
According to a search warrant affidavit, an open prescription bottle and pills were found on a countertop near Ms Arakawa in a bathroom.
Authorities retrieved medication that treats high blood pressure and chest pain, thyroid medication and Tylenol.
A toxicology report on the pills has been requested.
"That's obviously very important evidence at the scene," Sheriff Mendoza told NBC News, adding that the report could take three months or longer.
Two mobile phones, a 2025 monthly planner and MyQuest health records were also taken.
"We will try to gain access to the cell phones to analyse the data, calls, text messages, events and photos."
Are the deaths still considered suspicious?
Sheriff Mendoza has once again ruled out foul play but authorities are still investigating.
Investigators will work to piece a timeline together by analysing the evidence taken from the scene. They will also be interviewing maintenance workers, family members and security at the couple's gated community.
"We're doing a reverse timeline," Sheriff Mendoza said.
"We're doing a timeline from the time of death and the autopsy and the results, and we're going to start working our way backwards."
ABC/wires
