An undated letter from the mother of the man who killed Gabby Petito to her son will be allowed as possible evidence in a lawsuit Petito’s parents have filed against the parents of her killer

Brian Laundrie “seemed like a mental and emotional bully” to a cop who responded to a domestic call weeks before Gabby Petito was killed, according to an amended lawsuit.

A newly released photo appears to show Petito with injuries on her face moments before an exchange with police. ABC News' Andrea Fujii explains why officers are being accused in a wrongful death suit.

The mother and father of a woman killed by her boyfriend in 2021 joined Utah lawmakers to lobby for the passage of a law to require police statewide screen for risks of intimate partner violence

A circuit judge in Sarasota County, Florida, awarded Gabby Petito's family $3 million in a wrongful death lawsuit they filed against Brian Laundrie's estate back in May.

A Florida judge on Thursday awarded Gabby Petito's family $3 million in a wrongful death lawsuit filed against Brian Laundrie's estate.

Family members of Gabby Petito filed a wrongful death lawsuit against the Moab Police Department on Thursday in the latest development in the high-profile case around Petito's death

The family of a woman believed to have been killed by her fiancé during a road trip is now suing a Utah Police Department for negligence. ABC News’ Lionel Moise has the details.

The lawsuit alleges that if the Moab police had followed a Utah law on domestic violence, "Gabby would still be alive today," an attorney said Thursday.

The family of Gabby Petito, who was killed by her fiancé in August 2021, filed a $50 million lawsuit against the Moab Police Department.

Gabby Petito was stopped by police in Moab, Utah, before her disappearance.

Gabby Petito was found dead last year during a road trip with her boyfriend.

Several pages of Brian Laundrie's notebook were released by his family’s attorney where he admits to killing Gabby Petito but claimed it was a mercy killing.

The parents of Gabby Petito claim Brian Laundrie's parents knew he had killed their daughter.

The family of Petito will appear in court to defend the civil lawsuit they filed against the parents of Laundrie, the man who investigators say murdered the young woman in 2021.

The mother of Gabby Petito has filed a wrongful death lawsuit against the estate of Brian Laundrie in the latest legal action stemming from the homicide.

An FBI statement said the “investigation did not identify any other individuals other than Brian Laundrie directly involved” in Gabby Petito’s death. Laundrie died from a self-inflicted gunshot wound.

Investigators revealed new key evidence in the murder of Gabby Petito.

Gabby Petito's parents and stepparents want to help fight domestic violence and find missing persons with a foundation in her name.

The slain woman's parents and stepparents have established the Gabby Petito Foundation, with a mission to fight domestic violence and find missing people.

The death of Laundrie, who was the boyfriend of murdered travel blogger Gabby Petito, has been ruled a suicide, according to the Laundrie family attorney.

The death of Brian Laundrie, the boyfriend of murdered travel blogger Gabby Petito, has been ruled a suicide, according to the Laundrie family attorney.

“The biggest red flag is, why would you go camping by yourself for multiple days alone with just a backpack and leave your fiancé in your van?’” Miranda Baker said of Laundrie asking for a ride.

After reading reports calling for tips in Petito’s whereabouts, travel blogger Jenn Bethune and her husband reviewed video that captured a white van during their trip to Grand Teton National Park.

Jim Winder said body-camera footage showed “a significant debate” between officers “about the appropriateness of a physical arrest or not” during a police stop with Laundrie and Petito.

Private Investigator Jason Jensen said searchers had to cover “hundreds of square miles” of Grand Teton National Park’s “rugged, rocky terrain” while trying to locate Petito.

What don’t you know about her last days? Watch the breaking new 20/20 event special Friday night at 9/8c on ABC.

Plus, Parkland school shooter Nikolas Cruz pleads guilty to all counts, and Haiti’s former prime minister discusses the ongoing hostage situation gripping the country.

A Wyoming coroner said the 22-year-old's cause of death was strangulation and her body was in the woods three to four weeks before it was found.

The coroner in Jackson, Wyoming, determined that Petito was strangled to death and died three to four weeks before she was found.

The FBI is scouring a Florida nature reserve for Brian Laundrie after finding “items of interest” that have been identified by his family.

Authorities found items belonging to Laundrie, like a backpack and notebook, officials said, but they have not identified the remains.

In a new interview with Australia’s “60 Minutes,” Petito’s mother spoke candidly about Laundrie, saying he “seemed like a nice guy” and that her daughter “would be OK” with him.

The FBI shut down Carlton Reserve State Park and allowed Chris Laundrie to join the search for his son, who has been named a person of interest in the murder of Gabby Petito.

Steven Bertolino discusses how the Laundrie family is reacting after news that human remains found in a Florida nature reserve belonged to Brian.

The FBI confirmed that the skeletal remains were found in the Myakkahatchee Creek Environmental Park belonged to Laundrie, who was a person of interest in the murder of Gabby Petito.

Petito had been traveling with her boyfriend, Brian Laundrie, in a white van.

Brian Laundrie's girlfriend, Gabby Petito, was found strangled to death last month.

Remains found Wednesday in Florida during the search for Brian Laundrie have been confirmed as his, according to the FBI.

The FBI Denver released a statement Thursday afternoon that said they have confirmed the human remains found in the Carlton Reserve on Wednesday were those of Brian Laundrie.

Federal agents found a backpack and notebook in a Florida nature reserve belonging to Laundrie, and unidentified human remains.

FBI Special Agent in Charge Michael McPherson said police also found items that belonged to Laundrie, like a backpack and a notebook. McPherson said a team will be on site for several days.

Chief legal analyst Dan Abrams and former FBI agent Mary Ellen O’Toole discuss how the investigation will proceed after possible human remains and articles belonging to Laundrie were discovered.

Police have uncovered what may be human remains in Florida’s Myakkahatchee Creek Environmental Park along with articles that may have belonged to Laundrie, who has been missing since Sept. 14.

Petito, 22, died by strangulation, according to a Wyoming coroner.

A Wyoming coroner said the 22-year-old travel blogger was strangled to death. Her remains were recovered in a national park and the FBI is leading a nationwide search for her boyfriend Brian Laundrie.

ABC News’ Linsey Davis speaks with former FBI agent Brad Garrett about the coroner’s finding that Gabby Petito died by strangulation and what’s next in the investigation.

Wyoming coroner set to make announcement in Gabby Petito autopsy, medical examiner, Brian Laundrie, Florida, New York

A Wyoming coroner conducted an extensive forensic examination and toxicology report, but did not reveal the exact time Petito was killed

Authorities still haven't located the slain travel blogger's boyfriend after weeks of searching. Petito was found dead at Bridger-Teton National Park in September. Laundrie was last seen in Florida.