Diego Sebastián “N”—identified by authorities as the person who physically carried out the murder of Jonathan Meléndez (keyboardist for the band Camilo Séptimo) and his family—spent 25 years building a life in Mexico characterized by expedited naturalization, ventures across diverse sectors, four lawsuits filed by banks, and at least five legal proceedings that never resulted in imprisonment. This trajectory culminated on September 1, 2026, when he murdered his business partner and three other people in an apartment in Atizapán de Zaragoza, State of Mexico.
The 51-year-old man moved from pharmaceutical advertising to ATMs, and from urban gardening to luxury home rentals, all while accumulating legal disputes that never fully came to a head.
Diego Sebastián “N” was born on March 26, 1975, in Buenos Aires, Argentina. He left few traces in his home country: he had no criminal record, no pension contributions, and no declared profession, though he did have a registered tax address in the Saavedra neighborhood.
In 2001, the National Population Registry issued him a naturalization certificate recognizing him as a foreign-born Mexican national.
Comarketing Farmacéutico and Shark BTL: His first businesses
In August 2001, at the age of 26, Diego Sebastián “N” incorporated Ferlini, Rosen y Asociados, S.A. de C.V. alongside Marco Eladio Ferlini Bohm; Ferlini Bohm controlled 60% of the shares, while Diego held 10%. The company engaged in the purchase, sale, and importation of printed materials, recordings, and medical equipment.
In 2004, the company changed its corporate name to Comarketing Farmacéutico, S.A. de C.V. (registered under electronic commercial folio 281938 at the Mexico City Registry Office) and consolidated its focus on medical consulting. At the same time, in 2003, Shark BTL—a marketing agency based in Polanco—began operations; Diego Sebastián “N” presented himself as its CEO.
Medical Branding and an unresolved criminal case dating back to 2006
In July 2008, Diego Sebastián “N” founded Medical Branding de México, S.A. de C.V. (commercial registry number 385972), becoming the majority shareholder with a 50% stake alongside three other partners. The company provided consulting, advertising, and scientific conference organization services.
In 2006, Diego Sebastián “N” faced his first recorded criminal case in Mexico—identified as file number 128/2006—according to a review of Judiciary databases. No further details regarding the alleged offense are provided.
By 2011, Diego Sebastián “N” already held a passport identifying him as a Mexican citizen.
That same year, he attempted to register the trademark “Shark BTL” with the Mexican Institute of Industrial Property (IMPI); the application was rejected due to similarities with an existing entity.
ATMs and urban gardens: diversification in 2012 and 2013
In late 2012, Diego Sebastián “N” co-founded CAFADE, S.A. de C.V. (commercial registration number 485194) with Aldo Martínez Toriello; the company focused on the sale and installation of ATMs. He controlled 51% of the shares, equivalent to 255 shares valued at 25,500 pesos.
In July 2013, he incorporated Huerto Capital, S.A. de C.V. (commercial registration number 503671) alongside Moisés Gamus Duek and Xavier Fux Lachman; the company focused on designing rooftop gardens and vertical gardens. He was a minority shareholder, holding approximately 30% of the shares.
That same year, he registered two trademarks with the IMPI: “Huerto Capital Ciudad Orgánica” and “Blablabla! Habla y Navega” (intended for telecommunications services).
Fonatur rejects Shark BTL in a 2017 tender
In 2017, Shark BTL participated in public tender LA-021W3N003-E112-2017, issued by the National Fund for Tourism Promotion (Fonatur) to contract promotion and advertising services. The company submitted technical and administrative documentation but scored 28.74 points, resulting in its exclusion from the process for failing to meet the minimum required score.
That same year, Diego Sebastián “N” filed a petition for *amparo* (constitutional protection) against an arrest warrant with the Ninth District Court for Criminal Matters in Mexico City.
Fifty Fifty Total Production and the partnership with Paola Mandri
In March 2018, he founded his last formal company, Fifty Fifty Total Production, S.A. de C.V. (commercial registration No. N-2018021605), together with Paola Mandri Figueroa—his romantic partner, who is also an Argentine national. The company focused on audiovisual production, advertising, and event equipment rental, with Diego Sebastián “N” holding a 50% stake.
Four banks sue Shark BTL in 2019
In 2019, Shark BTL faced at least four commercial executive lawsuits. Court bulletins list Shark BTL, Diego Sebastián “N”, Norma Hilda Ferlini Bohm, and Jorge Rosen Marschoff in case files 358/2019, 1110/2019 Bis, and 221/2019; Diego Sebastián “N” is named as the custodian of assets, while the others are listed as jointly and severally liable parties.
From +Relax to Nomad: the business shared with Jonathan Meléndez
In February 2020, Diego Sebastián “N” made his last recorded visit to Argentina. By then, he was already operating a vacation rental business in Mexico that would later link him to Jonathan Meléndez.
That venture began under the name +Relax, managing luxury properties in Valle de Bravo—a destination Diego Sebastián “N” visited frequently, as documented on his social media. The brand later rebranded as Nomad Property Management and expanded operations to Tepoztlán, Acapulco, and Cuernavaca.
In Valle de Bravo, Meléndez and Diego Sebastián “N” jointly managed 32 properties, with nightly rates ranging from 7,000 to 50,000 pesos. However, the business was never formally incorporated into any of the five companies Diego Sebastián “N” had registered with the Public Commercial Registry. Amparo proceedings, a legal detention, and a failed attempt to bind over for trial
In 2023, Diego Sebastián “N” filed a second *amparo* petition, which he ultimately did not ratify. A year later, in 2024, he filed a third challenge against an arrest and appearance warrant; a court denied him a definitive suspension of the order.
In October 2025, he filed an *amparo* petition with the Second District Court for Criminal Matters in the State of Mexico (based in Toluca) challenging actions taken by a control judge specializing in search and arrest warrants. The case was dismissed because the authorities denied the existence of the challenged act.
That same month—December 2025—a judge ordered his legal detention in connection with an unspecified offense committed against two individuals. However, during a hearing held that same month, a ruling was issued declining to bind him over for trial.
