Osiel Cárdenas Guillén, the former leader of the Gulf Cartel and founder of the Zetas gang, has been released from a U.S. prison after serving most of a 25-year sentence for drug trafficking, money laundering, and threats against federal agents. His release on August 30 has raised concerns over his potential return to Mexico, where he faces multiple arrest warrants. Cárdenas Guillén, known as 'El Mata Amigos' or 'Friend Killer', was extradited to the U.S. in 2007 and sentenced in 2010, but it remains unclear why he did not serve his full sentence. Following his release, he was placed in the custody of U.S. Immigration and Customs Enforcement (ICE) for potential deportation. His criminal legacy includes the establishment of the Zetas, notorious for their violence and brutality in Mexico. The Mexican government has not yet confirmed whether it requested his return, but he is likely to face immediate detention upon arrival in Mexico.