The churchgoer killed when a gunman opened fire at a Laguna Woods church Sunday was a sports medicine doctor and master of martial arts who was slain while trying to stop the shooting, authorities said Monday.

Orange County sheriff’s officials said that when the suspect began shooting, Dr. John Cheng put himself in the line of fire and tried to prevent others from being shot.

According to the visiting pastor, Cheng, 52, of Laguna Niguel, was not a regular at the Irvine Taiwanese Presbyterian Church, which met Sundays at the Geneva Presbyterian Church, but had brought his mother to a special event honoring the former longtime pastor.

‘It is believed the suspect involved was upset about political tensions between China and Taiwan,’ Orange County Sheriff Don Barnes said.

“Dr. Cheng is a hero in this incident, based on statements from the witnesses and corroborated by other means. It is known that Dr. Cheng charged the individual — the suspect — [and] attempted to disarm him, which allowed other parishioners to then intercede,” Orange County Sheriff Don Barnes said at a news conference.

“He sacrificed himself so others could live,” Orange County Dist. Atty. Todd Spitzer added.

The violence occurred at a church luncheon honoring a pastor who had recently returned after several years in Taiwan. After Cheng was shot, witnesses said the pastor struck the suspect with a chair when he paused to reload his weapon and other members of the congregation tackled him.

“I knew something was wrong. I called 911,” a witness told The Times.

They hogtied him with an extension cord, a move officials think likely saved many more lives. The suspect had tried to seal the doors of the church hall to prevent people from getting out.

“The heroism of those individuals in that room is unbelievable to all of us in law enforcement. That these civilians took it upon them on their own to take him in to detain him to stop his movements. One person sacrificing his life. It is literally, literally inspiring and unbelievable,” Spitzer said.

Cheng, who ran a sports medicine practice in Aliso Viejo, leaves behind a wife and two children.

“He’s a beloved member of his community, is known for his hard work and work ethic and sports medicine, and our thoughts and prayers go out to him, his friends in the community for their loss, as well as the Geneva Presbyterian Church,” Barnes said.

Louis M. Huang, director general at the Taipei Economic and Cultural Office in Los Angeles, said his office has reached out to family members of all the victims in the shooting.

Four of the five victims, including Cheng, held Taiwanese citizenships, Huang said. The fifth was born in the Philippines but spoke Taiwanese because of their heritage.

The wounded were four men ages 66, 92, 82 and 75, and an 86-year-old woman. They have not yet been identified.

Of the four who were critically injured, two will likely leave the hospital in a day or two, Huang said. One may require a hospital stay of a week, and the other probably needs surgery, he said.

Authorities said Monday the suspect — identified as David Wenwei Chou, 68, of Las Vegas — appeared to be motivated by political hatred directed at the Taiwanese community, Orange County Sheriff’s officials said Monday. Chou was arrested Sunday and is being held in lieu of $1-million bail.

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Hannah Fry is a Metro reporter covering Orange County for the Los Angeles Times. She joined the newspaper in 2013 as a reporter for the Daily Pilot, a Times Community News publication. Fry most recently covered breaking news for The Times and was part of the team that was a 2020 Pulitzer finalist for its coverage of a boat fire that killed 34 people off the coast of Santa Barbara. She grew up in Orange County and got her start as an intern at the Orange County Register.

Jeong Park is an Asian American communities reporter for the Los Angeles Times. Previously, he was an economic mobility reporter for the Sacramento Bee, covering how California policies affect the lives of workers. He also covered cities and communities for the Orange County Register. Park considers both Seoul, where he was born, and Southern California, where he grew up, as his home. He graduated from UCLA. He welcomes recommendations for good hikes, food and K-Pop songs.

Richard Winton is an investigative crime writer for the Los Angeles Times and part of the team that won the Pulitzer Prize for public service in 2011. Known as @lacrimes on Twitter, during almost 30 years at The Times he also has been part of the breaking news staff that won Pulitzers in 1998, 2004 and 2016.