LOS ANGELES — A scuba dive boat captain was convicted Monday of criminal negligence in the deaths of 34 people killed in a fire aboard the vessel in 2019, the deadliest maritime disaster in recent U.S. history.

Jerry Boylan, 69, was found guilty of one count of misconduct or neglect of ship officer following a 10-day trial in federal court in downtown Los Angeles. The charge is a pre-Civil War statute colloquially known as seaman’s manslaughter that was designed to hold steamboat captains and crew responsible for maritime disasters.

Boylan is the only person to face criminal charges connected to the fire. He could get 10 years behind bars when he’s sentenced Feb. 8, though he can appeal. His public defenders declined to comment as they left the courthouse.

The verdict comes more than four years after the Sept. 2, 2019, tragedy, which prompted changes to maritime regulations, congressional reform and several ongoing civil lawsuits.

Relatives of those killed hugged one another and wept outside the courtroom Monday after the verdict was read.

Clark and Kathleen McIlvain, whose son Charles died at age 44, said they were relieved that there is finally some accountability for their loss.

“We are very happy that the world knows that Jerry Boylan was responsible for this and has been found guilty,” Clark McIlvain said.

The families also applauded and cheered outside the courthouse when the federal prosecutors arrived for a news conference to discuss the case.

Relatives of those killed hugged one another and wept outside the courtroom Monday after the verdict was read.

Clark and Kathleen McIlvain, whose son Charles died at age 44, said they were relieved that there is finally some accountability for their loss.

“We are very happy that the world knows that Jerry Boylan was responsible for this and has been found guilty,” Clark McIlvain said.

The families also applauded and cheered outside the courthouse when the federal prosecutors arrived for a news conference to discuss the case.

Although the exact cause of the blaze remains undetermined, the prosecutors and defense sought to assign blame throughout the trial.

The U.S. Attorney’s Office said Boylan failed to post the required roving night watch and never properly trained his crew in firefighting. The lack of the roving watch meant the fire was able to spread undetected across the 75-foot (23-meter) boat.

Boylan’s attorneys sought to pin blame on boat owner Glen Fritzler, who with his wife owns Truth Aquatics Inc., which operated the Conception and two other scuba dive boats, often around the Channel Islands.

They argued that Fritzler was responsible for failing to train the crew in firefighting and other safety measures, as well as creating a lax seafaring culture they called “the Fritzler way,” in which no captain who worked for him posted a roving watch.

The Fritzlers have not spoken publicly about the tragedy since an interview with a local TV station a few days after the fire. Their attorneys have never responded to requests for comment from The Associated Press, including on Monday.

Kendra Chan, 26, was killed on the Conception, along with her father, Raymond “Scott” Chan, 59. Vicki Moore, who was Raymond’s wife and Kendra’s mother, said Monday that justice was served.

“A strong message came through that if you are captain of a boat, you are truly responsible and there are consequences if you don’t follow the law,” Moore said after the verdict.

While the criminal trial is over, several civil lawsuits remain ongoing.

Three days after the blaze, Truth Aquatics filed suit under a pre-Civil War provision of maritime law that allows it to limit its liability to the value of the remains of the boat, which was a total loss. The time-tested legal maneuver has been successfully employed by the owners of the Titanic and other vessels, and requires the Fritzlers to show they were not at fault.

That case is pending, as well as others filed by victims’ families against the Coast Guard for alleged lax enforcement of the roving watch requirement.

The Channel Islands draw boaters, scuba divers and hikers. Five of the eight Channel Islands comprise the national park and Santa Cruz is the largest within the park at about 96 square miles.