SALINAS, California — A Monterey County jury has convicted Miguel Angel Espino, a 33-year-old inmate, of first-degree murder for the fatal stabbing of fellow prisoner Michael R. Spengler at Salinas Valley State Prison, according to prosecutors. The verdict was announced on April 23, 2026, following an intense trial where jurors heard evidence of a brutal attack that left Spengler, a 38-year-old serving life without parole, dead.
The incident occurred on August 19, 2024, when Espino allegedly used a weapon crafted by inmates to stab Spengler 42 times while both were on the recreation yard. Despite the immediate intervention of prison medical staff, Spengler died from excessive bleeding caused by his injuries. The district attorney’s office reported that the emergency response was quick, but Spengler was pronounced dead shortly after the attack.
During the trial, the jury determined that Espino committed the murder with willful and deliberate intent. They also acknowledged the particularly cruel nature of the crime, factors that hold significant weight in light of Espino’s prior convictions under California’s Three Strikes Law. Espino’s criminal history includes previous convictions from Riverside County, which now puts him at risk of facing a sentence ranging from 75 years to life in prison, to follow his existing term of seven years to life.
Prison officials initially classified the incident as a homicide investigation on the day of the stabbing. According to the California Department of Corrections and Rehabilitation, the attack began at approximately 10:31 a.m., and prison officers swiftly contained the situation, calling for medical assistance and notifying emergency services. No other inmates or staff were harmed during the incident, and a weapon was recovered from the scene.
Espino was transferred to state custody from Riverside County on February 8, 2024, where he was involved in a severe domestic violence case against his father. Prosecutors detailed that he assaulted his father with a hammer and a rock during a violent confrontation in a mobile home, ultimately setting the structure ablaze. The father required extensive medical treatment after the attack.
Witnesses to that earlier incident provided critical information to investigators, leading to Espino’s arrest. His mother had previously obtained a restraining order against him due to fears for her safety, adding to the family’s tumultuous history. Espino maintained his innocence, claiming that the fire was set by another individual, but prison recordings suggested otherwise.
Spengler, the victim, had a troubled past as well, convicted of two counts of murder in Los Angeles County and sentenced to life imprisonment. His crime record indicated that he was involved in ambush attacks on former friends, deemed extremely dangerous by the courts.
Salinas Valley State Prison, which has housed more than 3,300 inmates since its opening in 1996, is currently investigating the circumstances surrounding Spengler’s death. The prison’s Investigative Services Unit, alongside the Monterey County District Attorney’s office, are working to gather further details.
With the conviction finalized, attention now turns to sentencing, as Espino faces the potential of an extended prison term that will be added to his existing sentence following the violent altercation on August 19, 2024. The outcome of this case underscores the ongoing challenges faced in managing safety within prison environments.