Gabrielle Venora Petito was born on March 19, 1999, in Blue Point, New York, where she grew up before later relocating to Florida. Known to family and friends as Gabby, she was a young woman with a passion for travel and adventure, aspirations she shared openly through the social media accounts she maintained alongside her fiancé, Brian Christopher Laundrie. Before the events that would bring her name to international attention, Petito worked and built a modest online presence documenting her life, her relationship, and her plans for the future.

In 2021, Petito and Laundrie set out on a cross-country "vanlife" journey across the United States, a trip they planned to last approximately four months. The couple departed on July 2, 2021, chronicling their travels through vlogs and social media posts that captured their visits to national parks and landmarks across the country. Their documentation of the journey would later become central to the public's understanding of the case. On August 12, 2021, police in Moab, Utah, responded to a call involving the couple, and body camera footage from that encounter was later widely circulated. Petito was last seen on August 27, 2021, and her family reported her missing on September 11 after failing to hear from her for an extended period.

The circumstances of her disappearance drew intense public scrutiny, particularly after Laundrie returned alone to his parents' home in North Port, Florida, driving the van the couple had traveled in, and declined to discuss Petito's whereabouts. He was named a person of interest, and an arrest warrant was later issued accusing him of unauthorized withdrawals using her debit card. Laundrie left his family's home on September 13 and was reported missing by his parents four days later, prompting a widely followed search.

On September 19, 2021, Petito's remains were discovered in Wyoming's Bridger-Teton National Forest. An autopsy determined that she died from blunt-force injuries to her head and neck, as well as manual strangulation. On October 20, 2021, Laundrie's skeletal remains were found in Florida's Myakkahatchee Creek Environmental Park. An autopsy completed on November 23 confirmed that he died from a self-inflicted gunshot wound to the head. The FBI subsequently announced that Laundrie had admitted to killing Petito in a notebook discovered near his remains.

The case became one of the most heavily covered news stories of 2021, driven by the couple's social media documentation, leaked police body camera footage, 9-1-1 dispatch recordings, eyewitness accounts, and the conduct of Laundrie's parents. Petito's death sparked broader national conversations about domestic violence, media coverage of missing persons cases, and the treatment of victims in the public eye. Her family has since established the Gabby Petito Foundation, which works to support organizations assisting victims of domestic violence and to advocate for families searching for missing loved ones. Her story remains a lasting reminder of the dangers of intimate partner violence and the power of public attention in missing persons investigations.