Killings of María José Reyes and Juan Duarte

In July 2012, two people were killed in separate attacks at an antique shop in the small rural town of Lolol, Colchagua Province, O'Higgins Region, Chile. Both victims, Juan René Duarte Becerra and María José Reyes Moore, had entered the shop as customers.

According to Carabineros de Chile, the Chilean military police, on 10 July 2012 shop owner Óscar Segundo López Rodríguez stabbed Duarte, a local farmer, in the back and beheaded him. Police believed Duarte attempted to defend himself. López reportedly kept Duarte's head in a coffer displayed for sale in the shop and buried the rest of the body under rocks in his backyard. Duarte's family filed a disappearance report with Lolol police the following day.

On 12 July 2012, María José Reyes Moore, a physical education teacher from Vitacura in the Santiago Metropolitan Region, stopped at the same shop while traveling with two of her children. Within minutes, López attacked her, and her daughter ran to alert her brother. The two children then witnessed López taking their mother's body to a tree trunk in the backyard and decapitating her with an axe. The children ran into the street calling for help. A responding Carabineros sergeant, Felipe González, ordered López to stop and fired warning shots; when López advanced toward him with the axe used in the killing, González shot and killed him.

The same day, Chile's Labocar forensic laboratory, acting on the request of a public prosecutor, inspected the crime scene and located Duarte's decapitated body, which had not previously been found. Authorities also examined wells on the property and López's former residences, and investigated whether he might have been connected to the March 2012 disappearance of a man from the nearby commune of Pumanque, though no additional remains were found. Chile's Ministerio Público arranged for a "psychological autopsy" of López, based on interviews with people who knew him; results made public later in July 2012 indicated he had suffered from transitory psychosis and mystical delusions. Sergeant González received psychological support from the Carabineros, and his use of force was subject to internal review.

The killings drew widespread coverage in Chilean media, which referred to López as the "Monster of Lolol." Reyes was buried in Santiago after a funeral attended by about a thousand people; Duarte was buried in Lolol's municipal cemetery following a funeral attended by hundreds of residents. López's body was buried separately in Santa Cruz.