A Santa Maria man who detonated a bomb inside the Santa Barbara County courthouse in 2024 has pleaded guilty to federal charges, admitting he intended to kill sheriff's deputies and a judge after the initial blast failed to reach them. Nathaniel James McGuire, now 22, entered his plea before U.S. District Judge Jesus G. Bernal in Riverside federal court, closing out a two-year prosecution over an attack that injured three people and shut down the court complex for days.
Under the federal plea deal finalized this month, prosecutors agreed to recommend a prison sentence of no more than 30 years, along with lifetime supervised release; the agreement mentions roughly $35,000 in damage to the court facility, while restitution and any fine are to be imposed by the court, according to Noozhawk. Judge Bernal has scheduled McGuire's formal sentencing for March 1, 2027, where he still faces a statutory maximum of life in federal prison, per the U.S. Department of Justice. McGuire has remained in federal custody without bail since his arrest in September 2024, the DOJ noted.
A Bomb, a Battle Cry, and a Car Full of Weapons
On the morning of September 24, 2024, McGuire walked into the Santa Maria courthouse, lit a fuse, and threw a backpack containing an improvised explosive device past security toward sheriff's deputies while shouting “Liberty or death,” according to the Los Angeles Times. The bomb detonated in the hallway right outside Department 9, where McGuire had a hearing scheduled that morning, the newspaper reported. He was wearing body armor under his jacket at the time and escaped the blast uninjured.
According to his own plea agreement, obtained by Courthouse News, McGuire didn't stop after setting off the first device. He admitted that after the detonation, he went to his car to retrieve two long guns and 10 Molotov cocktails, intending to re-enter the courthouse to kill sheriff's deputies and, in his own words, “splatter” a judge. Courthouse security and law enforcement officers intercepted him at his vehicle before he could go back inside.
A search of that vehicle — a red Ford Mustang — turned up a shotgun, a rifle, ammunition, a flare gun, a box of fireworks, the 10 Molotov cocktails filled with isopropyl alcohol, and an additional suspected explosive device, the Times reported at the time of his arrest in 2024. It was quick intervention by courthouse security that kept McGuire from retrieving that arsenal and launching a second, far larger assault.
An Arraignment Turned Attack
McGuire was at the courthouse that day because he was scheduled for a morning arraignment on felony firearm charges stemming from a July 28, 2024, arrest for carrying an unregistered, loaded revolver, the Los Angeles Times reported. That earlier seizure of his weapons appears to have set the retaliation in motion.
The explosion filled the courthouse with smoke, caused approximately $35,000 in structural damage, and forced the entire complex to close for several days, according to The Guardian. Five people were hospitalized after the blast, and three suffered physical injuries, including burns, before all were released, per the same report.
State Charges Gave Way to Federal Case
In the immediate aftermath, Santa Barbara County prosecutors filed a ten-count state criminal complaint against McGuire in October 2024, including charges of attempted murder, arson, and using an explosive device to commit terror, according to edhat. The case proceeded in both state and federal court.
The investigation was conducted jointly by the FBI's Joint Terrorism Task Force, the Santa Barbara County Sheriff's Office, and the Santa Maria Police Department, the Department of Justice said. The U.S. Attorney's Office for the Central District of California prosecuted the case with support from the DOJ's Counterterrorism Section.
Federal prosecutors announced the guilty plea.
The attack put innocent lives at risk.
Part of a Wider Pattern of Threats
The Guardian, citing National Center for State Courts data, noted that federal judges, prosecutors, and court personnel faced more than 4,500 threats in 2021 alone, underscoring a broader trend of hostility toward judicial officers. The figures underscore the risks posed by threats to judicial officers.
For now, McGuire's fate rests with Judge Bernal, who will weigh the government's recommended 30-year cap against the statutory maximum of life in prison when sentencing convenes on March 1, 2027.
