A family of four that went missing last week, including two kids ages 5 and 6, is feared dead after law enforcement officials searched a property in Hudson, Florida, and found human remains, authorities said.

The Pasco County Sheriff’s Office said the owner of the property, 25-year-old Rory Atwood, has been charged with first-degree murder.

Sheriff Chris Nocco said during a press conference on Saturday that the human remains found on Atwood’s property have not yet been identified, though investigators believe they could be those of the missing family. For now, the sheriff’s office is referring to the remains as belonging to John Doe.

Investigators said 26-year-old Rain Mancini, 25-year-old Phillip Zilliot II, 6-year-old Karma Zilliot and 5-year-old Phillip Zilliot III were last seen at about 12:30 a.m. on June 12 near Nottingham Trail in Hudson.

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Authorities said that at about 11:30 p.m. on Wednesday, Mancini got picked up at her mother’s house by a friend who drove her to Atwood’s home on Nottingham Trail.

Nocco said that was the last time Mancini’s mother saw her daughter.

Mancini, her friend, Zilliot II, and Atwood were at the house with Mancini and Zilliot’s two children and Atwood’s daughter, officials said. During that time, the sheriff said, the adults were drinking.

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Zilliot II and his mother spoke over the phone at around midnight that night.

"Per Rain's friend, Rain, Phillip and Rory were all drinking alcohol, and they started arguing," Nocco said. Investigators are still working to piece together what happened that night, but at about 2 a.m., Atwood allegedly frantically called a friend to say he had shot someone.

It took at least 12 hours for someone to contact the sheriff’s office, Nocco said, and by then, the information coming in was third- or fourth-hand.

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On Thursday evening, deputies searched Atwood’s property with his permission. The property is about 10 acres of rural land, and authorities were unable to find anything out of the ordinary.

On Wednesday evening, investigators spoke with Mancini’s mother, who said she did not know where her daughter was and had not spoken with her since Wednesday.

Deputies returned to Atwood’s property on Friday night to search for the now-missing family, and human remains were discovered.

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"This along with several admissions is what led to Rory Atwood being charged with first-degree homicide," Nocco said.

Until the remains are identified, the missing-persons case remains active.

The sheriff’s office told Fox News Digital on Sunday that the investigation is ongoing and there was no new information to provide in terms of the identity of the remains.

Anyone with information on the whereabouts of these individuals is asked to call the Pasco Sheriff’s nonemergency line at 727-847-8102, option 7, or report tips online at pascosheriff.com/tips.

A former FBI special agent gave an inside look into how federal and state law enforcement apprehended the El Salvador migrant suspect in the multi-state homicide investigation of Rachel Morin.

Retired FBI Supervisory Special Agent Scott Duffey told Fox News Digital that, at the beginning of any homicide investigation, law enforcement starts with those closest to the victim.

"First and foremost, you start with loved ones, whether it be a spouse, a partner or a romantic partner," he said. "And then once you exclude them, then you move outward."

Duffey, who met with Morin's family in Harford County, Maryland, after her murder, said the FBI's Combined DNA Index System (CODIS) allowed law enforcement across state lines to stay on the same page as the 10-month investigation progressed.

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CODIS is a database used by federal and state law enforcement to compile DNA profiles of convicted offenders, unsolved crime scene evidence and missing persons.

A break in Morin's homicide case came after a piece of DNA evidence showed up thousands of miles from Morin's Maryland hometown in Los Angeles weeks after her disappearance.

"And lo and behold, the two DNA matches from DNA from Rachel Morin's crime scene and the DNA from LA were a match through CODIS," he said.

Morin said the CODIS operates under "strict guidelines," which gave him comfort about the legitimacy of the DNA match. 

"They have very strict guidelines, and the fact that you had two DNA matches was very comforting to me as a former investigator," he said.

The former special agent said the unexpected twist came after investigators discovered Morin's suspected killer, later identified as Victor Martinez Hernandez, an illegal El Salvador migrant, was not a U.S. national.

Martinez Hernandez's immigration status prompted law enforcement to rely on FBI international offices, called legal attachés.

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"What's their next stop out of the country into El Salvador?" Duffey said. "Now, it's one thing when you have a genealogical tree, and you're able to say, 'OK, we're getting closer' and the DNA experts are able to say, ‘Hey, this is a match’.

"But when you go out of the country, you lose certain ownership of an investigation."

The FBI international office in El Salvador was used to "bridge that gap" with law enforcement in the U.S. on Morin's case," Duffey said.

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"But having an FBI office in El Salvador, they're able to bridge that gap with American law enforcement and with El Salvadorian authorities," he said.

El Salvador authorities then communicated with U.S. law enforcement that Martinez Hernandez had fled his country of origin after brutally killing someone in the Central American country.

The news prompted the FBI to put out a "red notice," which told all law enforcement involved in Interpol to be on the lookout for Martinez Hernandez.

"That red notice would have alerted authorities, ‘Do not let this individual go any further. Stop and detain,'" Duffey said. "All those things are falling into place, not to mention the hard work that Harford County investigators pursued with LA authorities."

Duffey said he believes law enforcement used Martinez Hernandez's "digital forensics footprint" to piece together the final touches on its investigation.

"A cell phone, an email address, something that this individual is communicating with anybody else and thereby having such a footprint that law enforcement can zone in, pinpoint to a relatively small, very tight area to where surveillance could go out and investigate," he said.

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Duffey said it was "amazing" Martinez Hernandez, a wanted fugitive, managed to evade capture for 10 months after Morin's homicide.

"It will be interesting to see what his means were," he said. "Who was supporting this individual who was already a fugitive from justice from his country of origin?"

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On Saturday, Harford County Sheriff Jeffrey Gahler announced the arrest of Martinez Hernandez.

Gahler said the 23-year-old was arrested in Tulsa, Oklahoma, and charged with first-degree murder and first-degree rape.

The 23-year-old migrant illegally crossed into the United States in February 2023, police announced.

"We all suspected that Rachel was not his first victim," Gahler said. "It is my understanding that this suspect, this monster, fled to the United States illegally after committing the brutal murder of a young woman in El Salvador a month earlier, in January of 2023."

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Gahler said a first DNA match for Martinez Hernandez was from a Los Angeles attack in March 2023.

"Once in our country, and likely emboldened by his anonymity, he brutally attacked a 9-year-old girl and her mother during a home invasion in March of 2023 in Los Angeles," Gahler said. "And as everyone I believe is aware, that was our first DNA match linking Rachel's case to the one in Los Angeles."

Morin, 37, was reported missing in August by her boyfriend, who said she never returned after going out for a run on the Ma & Pa Trail, a pedestrian trail in Bel Air, a quiet and typically safe town about 28 miles northeast of Baltimore, Aug. 5, 2023.

Her body was found on a trail the next day.