The attack in Monterrey
On August 25, 2011, an armed group attacked the Casino Royale in Monterrey. The resulting fire killed 52 customers and employees. Contemporary reporting described the event as one of the deadliest attacks on civilians during that phase of Mexico's organized-crime violence.
Early public reporting included slightly different preliminary death counts, but the settled figure used by later Mexican prosecutions and retrospective reporting is 52. This page uses that later documented total.
Investigation and Los Zetas
Authorities arrested suspects within days and developed a case linking participants to Los Zetas. Investigators examined extortion as a possible motive. That motive is described here as the theory reported by investigators and prosecutors, not as a universal explanation for every defendant's conduct unless a court finding specifically established it.
The criminal response did not occur in one single trial. State and federal prosecutions unfolded over many years and addressed different defendants, charges and procedural histories.
Early convictions
By 2012, seven defendants had received some of the first major sentences in the case: one received 100 years and six others received 75 years after being found guilty of aggravated homicide and related offenses under Nuevo León proceedings. Additional defendants remained before the courts.
In 2018, three defendants were again sentenced to 75 years after procedural issues required portions of their cases to be repeated. Contemporary reporting noted that other defendants still had pending legal challenges at that time.
Later federal sentences
Accountability continued well after the first wave of trials. In 2024, Mexican reporting described federal sentences of up to 60 years against ten members of Los Zetas in a related organized-crime proceeding.
In July 2025, the Federal Attorney General's Office announced a new conviction against Baltasar “S.” Reporting on the FGR announcement stated that he received 135 years in prison in a federal case involving organized crime, drug offenses and kidnapping, and identified him as a participant in the Casino Royale attack. The sentence was not presented as a single 135-year punishment exclusively for 52 homicide counts; the federal judgment addressed multiple offenses. That distinction matters.
What the convictions establish
The multiple proceedings establish substantial criminal accountability for people who participated in or supported the attack. They do not justify treating every person ever arrested, named or investigated as convicted. This file therefore names outcomes only where a sentence or reliable account of a judgment is documented.
Because the attack produced different cases at state and federal levels, the archive classifies it as solved / extensively adjudicated rather than implying that one judgment alone resolved every investigative question.
Timeline
August 25, 2011: the Casino Royale is attacked in Monterrey; 52 people die.
August 29, 2011: authorities announce the first arrests while additional suspects are sought.
December 2012: seven defendants receive some of the earliest long prison sentences in the case.
December 2018: three defendants receive 75-year sentences after proceedings are repeated following legal challenges.
August 2024: Mexican reporting describes federal sentences of up to 60 years against ten members of Los Zetas in a related organized-crime case.
July 2025: Baltasar “S.” receives a 135-year federal sentence in a case that included organized crime and kidnapping offenses; authorities identify him as a participant in the Casino Royale attack.
Current status
Multiple defendants have been convicted and sentenced in criminal proceedings connected to the Casino Royale attack. The event is therefore treated as solved / adjudicated for archive purposes, while the page preserves the separate procedural histories and does not collapse every prosecution into one judgment.