Ke Chieh Meng, 64, was stabbed fatally while walking her dogs on Saturday, police said, calling the incident a random attack.
Officers responding to several calls about a woman suffering from stab wounds on Golden Avenue in the city's La Sierra neighborhood arrived at the scene to find her on the ground bleeding from abdomen area.
Meng was transported to a local hospital, where she was pronounced dead later, according to the station.
The attacker was identified as Darlene Stephanie Montoya, 23, and was arrested near the scene.
“There was nothing to suggest that the victim was attacked due to her ethnicity,” Riverside Police Department spokesman Ryan Railsback said Sunday.
“We’re going to try to research [the suspect’s] drug-abuse history and her mental-health history,” Railsback said, adding that officers are nevertheless “not closing the door on anything.”
Montoya was booked at the Robert Presley Detention Center on suspicion of murder, a weapons violation and also charged with being under the influence of a controlled substance.
On March 30, she was also arrested after she allegedly attacked a woman with a skateboard near a local shopping center. She was charged with assault with a deadly weapon but was freed without bail because of Covid-19 restrictions.
The attack on the Asian woman comes less than a month after deadly shootings in Atlanta that left eight people, six of them of Asian descent, dead.
The shootings happened at three separate massage parlors in and around Atlanta, Georgia on March 16.