The Gill family — Rubén "Mencho" Gill, his wife Margarita Norma Gallegos, and their four children María Ofelia, Osvaldo José, Sofía Margarita, and Carlos Daniel — disappeared on January 13, 2002, from the La Candelaria estancia in Crucecitas Séptimas, Entre Ríos Province, Argentina, about 50 km from the provincial capital Paraná. Rubén and Margarita worked as landlords and in various local jobs on the roughly 500-hectare property, which belonged to Alfonso Goette.
On the night of January 12, 2002, the family visited a friend, Máximo Vega, in the nearby town of Viale. This was the last confirmed sighting of the family. Calls were made from Rubén's cell phone on January 13 to a woman in Rosario who could not be traced; the phone remained active until April 2003. A neighbor named Villanueva reported seeing "Mencho" Gill on horseback on January 14. It was not until April 2002 that Goette contacted relatives to say the family had not returned from a purported three-month vacation. Rubén's sister, Luisa Eva Gill, filed the initial missing-persons report at the Viale police station. The case was first handled by justice Jorge Sebastián Gallino and, from mid-2015, by judge Gustavo Acosta.
Investigators found it unlikely the family left voluntarily, since they had no vehicle and Margarita, who also worked at the local school, had not received her latest salary. In 2006, the family's plaintiff lawyer, Elvio Garzón, raised a hypothesis that police officers may have been involved, linking it to other disappearance cases, though this was not formally investigated. A 2008 raid at the estancia used luminol to detect blood traces and recovered three human blood samples that did not match the Gills' genetic profiles, though experts noted possible contamination over time. A "psychological autopsy" that year found no psychological or religious reasons for the family to have severed ties with loved ones, though witnesses described Rubén as unusually withdrawn in the days before the disappearance. Further searches occurred in 2011, 2015 (including a drone survey), and 2018, when rural contractor Armando Nanni provided a lead about wells Rubén had complained about digging shortly before he vanished; a subsequent search of a water well found only animal bones.
Estancia owner Alfonso Goette suggested the family may have traveled to Santa Fe or migrated northeast for work, and said they left belongings, money, and documents behind — but relatives disputed this, reporting burned mattresses and blood mixed with dirt in the room. Luisa Gill alleged Goette burned the mattresses because they were bloodstained and questioned his account of having granted a lengthy vacation. Suspicion fell on Goette due to the delayed report of the disappearance and accounts of a poor relationship with the family, though no compromising evidence was found against him. Goette died in a vehicle crash on Route 32 near Seguí on June 16, 2016, at age 78; a police commission was subsequently formed with the possibility of reopening aspects of the investigation. The case remains unsolved, and no charges have been filed.