Man Admits to Bombing Santa Maria Courthouse in Retaliation over Seized Gun

A Santa Maria man has pleaded guilty to federal charges for detonating a homemade bomb inside the Santa Maria courthouse in September 2024, an attack that injured five people and rattled a building that serves thousands of North County residents every week. Under the terms of a plea agreement signed this month, federal prosecutors will recommend a sentence of no more than 30 years in prison for Nathaniel McGuire, who was 20 years old at the time of the bombing, according to the Santa Barbara Independent.

McGuire, now 22, pleaded guilty to using a weapon of mass destruction and maliciously damaging a building by means of an explosive. He is scheduled to be sentenced in U.S. District Court on March 1.

The Attack

The bombing occurred at approximately 8:40 a.m. on September 25, 2024, as McGuire arrived at the Santa Maria courthouse for his arraignment on a pending firearms case. He had been arrested roughly two months earlier for carrying a loaded, unregistered revolver, which police confiscated — the seizure that prosecutors say motivated his retaliation.

According to the Independent's reporting, McGuire arrived wearing body armor, leaned through the courthouse entrance, and threw a backpack containing an improvised explosive device past the security checkpoint toward two sheriff's deputies stationed in the lobby. The device slid between one deputy's legs and detonated just outside the courtroom where McGuire was set to appear, filling the building with smoke and injuring five people.

McGuire then ran back to his red Ford Mustang, where he had stored two long guns and 10 Molotov cocktails. In his plea and statements to investigators, he admitted he planned to re-enter the building to kill more people and to "splatter" — his word for killing — the judge handling his case. He never got the chance: a private security guard and several deputies apprehended him at the car. Witnesses reported he yelled that the government had taken his guns and that citizens needed to "fight," "rise up," and "rebel."

A later search of McGuire's residence turned up additional bomb-making materials, prosecutors said, including black powder, unused fireworks, papers that appeared to contain explosives instructions, and an empty can with nails attached to its exterior.

A 'Shocking and Unprecedented Crime'

Santa Barbara County Sheriff Bill Brown described the bombing at the time as a "shocking and unprecedented crime" for the county, and the response reflected that: the blast set off a massive law enforcement mobilization at a facility that houses courtrooms, clerk offices, and county workspaces serving the Santa Maria Valley.

First Assistant United States Attorney Bill Essayli said in a statement that McGuire's "brazen act of terror resulted in physical, structural, and emotional harm, and could have had tragic consequences," adding that "individuals who use bombs against law enforcement officials, judges, and other government personnel must be held accountable and face severe punishment for their actions."

The plea deal resolves only the federal case against McGuire. He still faces separate state charges — including two counts of attempted murder — that remain pending and could add to whatever prison time he receives. Before the 2024 firearms arrest, McGuire had no prior criminal history, and he has remained in custody since the day of the bombing.

The Guard Who Stopped Him

Much of the credit for preventing a far deadlier outcome has gone to Steve Neil, a private security guard who was stationed near the courthouse entrance the morning of the attack. According to the Independent, Neil chased McGuire into the parking lot after the blast, pulled him from the driver's seat of the Mustang, and held him on the ground — unarmed — until deputies arrived.

The county Board of Supervisors recognized Neil the following month for "exceptional courage and heroism." Supervisor Bob Nelson said Neil's actions likely prevented significant loss of life, and Sheriff Brown publicly praised his bravery.

Neil's background made him, in an unlikely way, well suited for the moment. He grew up in Belfast, Northern Ireland, during the Troubles, later served in the British Army, and moved to Santa Maria in 1982. He had worked at the courts for about 15 years at the time of the attack. Neil has credited his military experience, his upbringing around bombings in Belfast, and training from his employer, Triumph Protection Group, with helping him react so quickly.

What Comes Next

For Santa Barbara County residents, the plea brings a measure of closure to one of the most violent attacks on a government facility in recent county history — but the case is not over. McGuire's federal sentencing on March 1 will determine how much of the recommended 30-year cap he actually receives, and his state prosecution, with its attempted murder counts, will proceed separately in county court.

The case has also left its mark on the North County courthouse community, where deputies, clerks, attorneys, and members of the public who were present that morning continue to deal with what federal prosecutors described as emotional, physical, and structural harm. Courthouse security procedures and the role of contracted guards like Neil have drawn renewed attention from county officials since the bombing.

805.life will continue to follow McGuire's sentencing and the state court proceedings as they develop.