David Chou's court appearance last about five minutes on Tuesday as he went before a judge remotely.
His arraignment date was expected to be announced on Tuesday but it was delayed until June 10. He's now being held on no bond.
Orange County District Attorney Todd Spitzer announced the charges against Chou during a Tuesday news conference.
Aside from the first-degree murder charge for the death of 52-year-old John Cheng, Chou also faces five counts of attempted murder and four counts of possessing destructive devices with the intent to kill or harm.
Prosecutors are also seeking an enhancement for "lying in wait."
Those charges could carry a maximum sentence of death or life without the possibility of parole, Spitzer said.
"We typically think of the person who hides in the bushes," Spitzer said. "This case is about the person concealing themselves in plain view."
Spitzer added Chou was deliberate when he decided to open fire on a Taiwanese congregation that had gathered inside the Geneva Presbyterian Church's banquet hall on Sunday, May 15.
He said every case is unique and as he and his office look at the facts, Spitzer can quickly decide if he will seek the death penalty or not.
"I will share with you this case is definitely a case that I'm looking at for death," Spitzer said.
Authorities have said Chou - a U.S. citizen whom authorities say grew up in Taiwan - was motivated by hatred of Taiwanese people.
"While there's very strong evidence right now that this was motivated by hate, we want to make sure we have put together all the evidence that confirms that theory in the case," Spitzer said, when asked whether he would be filing charge of a hate crime.
Chou is accused of opening fire during a luncheon for members of Irvine Taiwanese Presbyterian Church, which worships at Geneva Presbyterian Church in the community of Laguna Woods.
Cheng, a doctor who heroically charged the gunman, was killed and five other people were wounded.
Chou drove to Orange County on Saturday and the next day attended the lunch.
Though he knew no one there, he spent about an hour mingling with about 40 attendees and then executed his plot, authorities said at a news conference.
He chained the doors and put super glue in the keyholes, authorities said.
Chou had two 9 mm handguns - legally purchased years ago in Las Vegas - and three bags, containing among other things four Molotov-cocktail-type incendiary devices and extra ammunition.
Authorities said Chou opened fire and in the ensuing chaos, Cheng tackled him and tried to disarm him, allowing others to jump in and help.
The parishioners ended up tying Chou up with extension cords, authorities said.
Chilling photos obtained by ABC7 show the moment Chou was subdued by heroic congregants.
Cheng, who leaves behind a wife and two children, was shot several times during the struggle and died at the scene.
"Without the actions of Dr. Cheng, it is no doubt that there would be numerous additional victims in this crime," Barnes said.
READ MORE | Prominent OC doctor killed while trying to stop Laguna Woods church shooting suspect, sheriff says
The other injured victims, four men and one woman, were identified as being between the ages of 66 and 92.
They were all taken to local hospitals for treatment -- two of them to Orange County Global Medical Center, which issued a statement Monday on the condition of two of the victims.
"Both patients were admitted to the hospital following treatment in our trauma center. Both are in stable condition, expected to fully recover from their injuries, and discharged in the next 24 to 48 hours," the statement said in part.
According to police, Chou's anger reportedly began when he lived in Taiwan, saying his "anti-Taiwan views" were not accepted. Police said officers found notes in his vehicle indicating his hatred toward Taiwan.
Tensions between China and Taiwan are at the highest in decades, with Beijing stepping up its military harassment by flying fighter jets toward the self-governing island. China has not ruled out force to reunify with Taiwan, which split from the mainland during a civil war in 1949.
In a statement through her office, Taiwan's president, Tsai Ing-wen, condemned the violence and extended her condolences to those killed and injured.
Her office said she also asked Taiwan's chief representative in the U.S., Bi-khim Hsiao, to fly to California to provide assistance.
According to Taiwanese media, Chou had ties to a Chinese-backed organization opposed to Taiwan's independence, although details could not immediately be confirmed.
Meanwhile, the Laguna Woods community continues to mourn.
On Tuesday, several people were seen stopping by the church to drop off flowers.
"I myself am Taiwanese, so I felt just more of a connection to this one, and I felt that I just wanted to do my part to come here to pay my respects and say prayers to those who are affected," said Ruth Cheung.
Other residents like Yuan Li said they're in shock. He said he wants people to reflect on those who matter most, Cheng.
"It shouldn't be like this," he said. "We can have different point of views, but these can be solved in different ways. Not like this. We do feel [Cheng's] the one who should be remembered, not the person who do this terrible thing. We should forget that person."
The Associated Press contributed to this report.