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Data from actor Gene Hackman’s pacemaker shows he was likely dead for nine days before he and his wife were found dead at their New Mexico home, authorities said.The pacemaker shows Hackman’s “last event�� was recorded on February 17, Santa Fe County Sheriff Adan Mendoza said at a Friday news conference. “According to the pathologist, I think that is a very good assumption, that that was his last day of life,�� the sheriff said.Hackman and his wife, along with their dog, were found dead this week in circumstances officials deemed “suspicious enough�� to warrant thorough investigation.As authorities investigate their deaths, several items have been taken from the couple’s home.Two green cellular devices were removed, along with three medicines: a thyroid medication, Diltiazem �� used to treat high blood pressure or chest pain �� and Tylenol, according to the inventory released Friday as part of a search warrant affidavit in Santa Fe County court.Also seized by sheriff’s deputies were records from MyQuest �� a medical diagnostics service �� and a 2025 monthly planner, it says.The causes of death of Hackman, 95, and Betsy Arakawa are not known. The pair did not show any external trauma, and there were no immediate signs of foul play, according to preliminary autopsies and officials. There were also no immediate signs of a carbon monoxide or natural gas leak, authorities said.Both Hackman and his wife tested negative for carbon monoxide, Mendoza said Friday.The couple’s bodies were found in separate rooms in their secluded house, with scattered pills found next to Arakawa, according to the sheriff’s office. Investigators have not yet determined whether Hackman and Arakawa died at the same time, Santa Fe County Sheriff Adan Mendoza told NBC’s “Today Show�� on Friday morning, but they both likely had been dead for some time before they were discovered.“It appears (to be) several days, possibly even up to a couple of weeks,�� Mendoza said. And narrowing down exactly when could be a challenge, experts told CNN.Investigators are working to piece a timeline together by analyzing a planner found at the home and cell phone data, including phone calls, text messages, events and photos. They’ll also be interviewing maintenance workers, family members and security at the couple’s gated community.“We’re doing a reverse timeline,�� Mendoza said Friday. “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.”Hackman was an Oscar-winning actor known for his roles in films such as “The French Connection,�� “Hoosiers, “Unforgiven�� and “The Firm.�� Arakawa, three decades Hackman’s junior, was a classical pianist.Here is what we know about their deaths.Hackman was an Oscar-winning actor known for his roles in films such as "The French Connection," "Hoosiers," "Unforgiven" and "The Firm." Arakawa, who was three decades Hackman's junior, was a classical pianist.Here is what we know about their deaths.911 caller saw Hackman and Arakawa lying on the floor through windowHackman’s and Arakawa’s bodies were discovered by maintenance workers at the home just before 2 p.m. local time Wednesday, according to the sheriff’s office affidavit for a search warrant obtained by sister station KOAT.In a 911 call obtained by CNN, a caller said they could not enter the home but could see two unconscious people through the window."No, dude, they’re not moving. Just send somebody out here really quick," the caller said.Police responded to the call and discovered Arakawa's body on the ground inside a bathroom next to an orange prescription pill bottle with scattered pills on the floor, the affidavit said.The body "showed obvious signs of death, body decomposition, bloating in her face," the affidavit said.Hackman's body was then found on the ground near the kitchen in a similar condition. A walking cane and sunglasses lay next to the body. The deputy suspected he had suddenly fallen, the affidavit said.A German shepherd dog was also found dead in the bathroom. The affidavit initially said the dog was in a closet, but police later clarified it was in a crate. Two other healthy dogs were found on the property.The couple had been deceased for quite a while, Santa Fe County Sheriff Adan Mendoza told reporters Thursday. The maintenance workers told police they had not been in touch with the homeowners for two weeks, the affidavit said.Other clues might pinpoint when they diedThe couple had been deceased for quite a while, Mendoza told reporters Thursday. The maintenance workers told police they had not been in touch with the homeowners for two weeks, the affidavit says.Determining who may have died first is a “very hard determination to make,�� Mendoza said Friday. “I don’t think even (the medical examiner) could make that determination based on the initial autopsy.”While the condition of a body can provide general clues as to the time of death, it can only be an estimate, a forensic investigator not involved in the Hackman investigation told CNN.“Under ideal circumstances and under ideal conditions, you can make a determination or get a general idea of how long they’ve been dead, but those circumstances are often never there,�� said Dr. Kendall Crowns, chief medical examiner for Tarrant County, Texas.Even a full autopsy cannot pinpoint the time of death, said Dr. Priya Banerjee, clinical assistant professor of forensic pathology at Brown University.“It’s not like TV where we have it to the day or the minute,�� Banerjee said.Instead, medical examiners also have to rely on electronic evidence collected by police �� such as phone records �� to narrow the timeline.“Oftentimes, if it’s more than a few days, there may be mail outside that’s uncollected,�� said Banerjee. “Even something like a Ring (doorbell) camera or a neighbor’s Ring camera that might have picked them up outside.”Deaths 'suspicious enough' to warrant thorough investigationThe cause of the couple's deaths is under investigation, according to the sheriff's office."The circumstances surrounding the death of the two deceased individuals (are considered) to be suspicious enough in nature to require a thorough search and investigation," a sheriff's deputy said, according to the affidavit."There was no obvious sign or indication of foul play," Mendoza said, adding there was no sign of a struggle or that items had been taken from the home.Fire officials called to the scene "did not locate signs of a carbon monoxide leak or poisoning," and a gas company crew conducting tests of gas lines in and around the home did not immediately identify any problems, the affidavit said.Official autopsy and toxicology reports are pending, and carbon monoxide and toxicology tests have been requested for both Hackman and Arakawa, according to the sheriff’s office.Toxicology reports could take monthsOfficial autopsy reports are pending, and toxicology tests have been requested for Hackman and Arakawa, according to the sheriff’s office.Medical examiner’s reports with a final cause of death usually take four to six weeks to complete, state Office of the Medical Investigator spokesperson Chris Ramirez said.However, the toxicology report could take three months or longer to complete, depending on the laboratory’s workload, Mendoza told NBC.The actor’s family is “devastated by the loss,�� Hackman’s daughters and granddaughter said in a statement.“It is with great sadness that we announce the passing of our father, Gene Hackman and his wife, Betsy,�� the statement said. “He was loved and admired by millions around the world for his brilliant acting career, but to us he was always just Dad and Grandpa. We will miss him sorely.”Hackman will be honored at Sunday's Academy AwardsNews of Hackman's death comes just days before the Academy Awards this weekend.Throughout his five-decade career, Hackman won two Oscars and was nominated for five.He won an Oscar for his portrayal in 1971’s "The French Connection" of New York cop Popeye Doyle, a detective who gets his man but at a high cost. He won his second Oscar for his performance as Little Bill Daggett, the violent sheriff in Clint Eastwood's 1992 film, "Unforgiven."A source familiar with behind-the-scenes planning at the Oscars told CNN the actor will be honored at Sunday’s ceremony.Video above: Conan O'Brien promises 'sensitive' Oscars ceremonyDetails are not locked in yet, but one possible scenario, the source said, is editing the "In Memoriam" montage to include Hackman's contributions to cinema.Another possibility is a scripted mention of Hackman's passing on stage, perhaps by host Conan O'Brien or another entertainer who would pay tribute to the acting legend.Todd Leopold, CNN’s Elizabeth Wagmeister and Amanda Musa contributed to this report.