Mario Alberto Peña

Peña was killed in Comales, a rural community near Camargo, Tamaulipas, on 19 March 2013. According to security forces, Peña was killed as part of an internal strife incident within the Gulf Cartel that dated back to September 2011, when suspected Gulf Cartel leader Samuel Flores Borrego (alias "Metro 3") was killed by members of his own criminal group. Peña was confirmed dead by U.S. federal authorities, when his body was taken to the international crossing by his family members. Mexican authorities also confirmed his death. According to Peña's sister, the family was able to recover the body with the help of another Gulf Cartel regional leader, Juan Francisco Sáenz Támez, alias "Comandante Panochitas" (English: "Commander Pussy"). Peña was buried in a private ceremony in Texas. His family told the McAllen-based newspaper The Monitor in an interview that Peña died "with honor". When Peña was alive, he was regarded as a charismatic gangster and folk hero on both sides of the Mexico–United States border.

On 16 August 2011, Peña and an accomplice, Daniel Bazán, committed a drive-by shooting at a residence in Alto Bonito Heights, Texas. According to eye-witnesses, both men arrived at a property in a vehicle and shot at the place using AR-15 assault rifles and other pistols. The Starr County Sheriff's Office issued a bulletin asking the public to reach out with any information about Peña's whereabouts. The wanted flyer said Peña was approximately 5 ft 10 in (1.78 m) and weighed 210 lb (95 kg). He was described as having brown eyes and hair, a beard and mustache, and tattoos in multiple parts of his body. Deputy Erasmo Rios said they believed Peña was hiding in the Starr County area, but recommended civilians not try to apprehend either him or his accomplice because they were considered armed and dangerous. The warrant against both men was for attempted capital murder. Peña fled to Mexico shortly after he was charged.

Mario Alberto "Popo" Peña (22 October 1980 – 19 March 2013) was a U.S.-born Mexican suspected criminal and high-ranking member of the Gulf Cartel, a criminal group based in Tamaulipas, Mexico. He started his criminal career in a local Texan gang before joining the Gulf Cartel, where he worked as a regional leader in an area known as La Ribereña, across the border from Starr County, Texas. Though born in the U.S., Peña worked in Mexico and maintained close ties with Texas. Known for his charisma and heavily tattooed body, Peña was viewed as a gangster folk hero on both sides of the Mexico–United States border. In 2013, he was betrayed and killed by an alleged member of the Gulf Cartel. Several people paid tribute to him online by creating a Facebook page and uploading photos and rap music videos in his memory.

Mario Alberto Peña, known as "Popo" or "Comandante Popo" (English: "Commander Popo"), was born in Rio Grande City, Texas, United States, on 22 October 1980. He grew up in Roma, Texas, and started his criminal career for a local Texan street gang. He eventually joined the Gulf Cartel, a criminal group based in Tamaulipas, Mexico. In the Gulf Cartel, Peña was a regional leader in an area in Tamaulipas known as La Ribereña, which sits across Starr County, Texas. Though born in the U.S., Peña operated primarily in Mexico and maintained ties with the Rio Grande Valley.