Jonathan Meléndez, a 38-year-old keyboardist for the Mexican rock band Camilo Séptimo, was found dead inside his apartment in Atizapán de Zaragoza, State of Mexico, on a Wednesday morning. ^[1] Meléndez was killed alongside his pregnant wife Ana Paola, their three-year-old daughter, and a 21-year-old housekeeper named Aleyda Romero who worked in the home. ^[2] On September 1, 2026, Jonathan Meléndez, a keyboardist and founder of the band Camilo Séptimo, was murdered along with his pregnant wife, their three-year-old daughter, and a domestic worker in Atizapán de Zaragoza. ^[3] Diego Sebastián Rosen Ferlini, identified as a suspect in the assassination of Jonathan Meléndez, the keyboardist for the band Camilo Séptimo, founded five companies in Mexico between 2001 and 2018. ^[4] Diego Sebastián Rosen Ferlini was detained on September 1, 2026, in the fraccionamiento Grand Viure in Zona Esmeralda, Atizapán de Zaragoza, for his alleged participation in the mass murder of Jonathan Meléndez and three other victims. ^[5] According to a review by EL UNIVERSAL of the Public Commercial Registry, Diego Rosen Ferlini founded five companies in Mexico between 2001 and 2018. ^[6] A six-year-old boy, Meléndez's older son, survived the shooting by hiding under his bed while the other victims were killed. ^[7] Neighbors alerted authorities to the incident after hearing screams and gunshots from the apartment during the early hours of the morning. ^[8] A six-year-old son of Jonathan Meléndez survived the September 1, 2026 attack by hiding for hours until police arrived. ^[9] In March 2022, a court sentenced Andrés Filomeno Mendoza Celis to life imprisonment for the femicide of Reyna González Amador. ^[10] On September 12, 2023, Ana María Serrano Céspedes, an 18-year-old medical student, was found dead in her home in the Condado de Sayavedra subdivision. ^[11] Omar García Harfuch, Mexico's Secretary of Security and Citizen Protection, stated that investigations identified Rosen Ferlini as a partner of Meléndez, suggesting he used this relationship to gain access to the victim's home in Atizapán de Zaragoza where the crime was committed. ^[12]