Authorities have found no criminal history for the suspect in the Monterey Park mass shooting, ABC News has learned.

Investigators are still looking into a possible motive, including domestic violence.

-ABC News' Josh Margolin and Alex Stone

The man who disarmed the Monterey Park mass shooter recalled how "something came over me" during an interview Monday on ABC News' "Good Morning America."

"I realized I needed to get the weapon away from him," Brandon Tsay said. "I needed to take this weapon, disarm him or else everybody would have died."

The dance studio in Monterey Park where Saturday's mass shooting took place has released a statement.

"What should have been a festive night to welcome the first day of the Lunar New Year turned into a tragedy. Our heart goes out to all the victims, survivors, and their families," Star Dance Studio said in a Facebook post late Sunday. "In this time of healing, we hope that all those who were affected have the space to grieve and process what transpired within the last 24 hours. In the meantime, all classes will be canceled and studio will be closed until further notice."

Shally was dancing the jive with her longtime dance partner on Saturday night when a gunman entered the studio and opened fire.

"We go to hide under the table," Shally, who only provided her first name, recalled during an interview with Los Angeles ABC station KABC. "I think [my partner] had got shot already but not realized yet."

Shally said she saw the gunman leave to get more bullets. When he returned, he reloaded the gun and opened fire again, she said.

"I said, 'Lie down.' We all lied down," Sally told KABC.

Shally said the shooter then fled the scene and she turned to her partner, who she realized was unconscious. She tried to wake him but then saw her hands were covered in blood, she said.

"I thought I got shot too," she told KABC.

Shally said she then realized that her partner had been shot in the back and the blood on her hands was his, from when they were holding each other in fear while hiding under the table.

"'Wake up, wake up,'" she recalled telling her partner. "He was dead."

Shally, who did not want to share the name of her dance partner, said he was a good friend and that they had danced together every week for about 10 years. She described him as a 62-year-old Asian man who didn’t have any family and said he was also friends with her husband, whom she married a couple years ago.

"He's a nice guy," she told KABC of her dance partner. "We love to dance."

Valentino Alvero, a 68-year-old killed in the massacre, “was a loving father, a dedicated son and brother, a grandfather who loved his three granddaughters fiercely,” and “an uncle who loved his nieces and nephews like his own,” his family said in a statement.

“He loved ballroom dancing, he loved his community, and was the life of any party,” the family said.

The family called out the “vicious cycle” of mass shootings, saying, “We became unwilling members of a community who has to mourn the loss of our loved ones due to gun violence.”

The family continued: “It is also a great travesty that he did not receive last rites. He was a devout Catholic and our family would like to request all priests and Catholics to pray for him by name, Valentino Marcos Alvero. Please offer up any Masses or rosaries you can for the repose of his soul. Pray for Valentino by name, and for the souls of all victims of mass shootings and for an end to mass shootings in our nation and our world.”