COVINA — A 43-year-old woman has been charged with fatally stabbing her 61-year-old mother at a Covina senior living facility, the Los Angeles County District Attorney’s Office announced Wednesday.

Althina Sumi Rivera (Covina Police Department)

Athina Sumi Rivera of Los Angeles has been charged with one count of murder. The felony complaint includes a special allegation that the defendant personally used a deadly and dangerous weapon, a knife, during the commission of the crime.

Rivera was scheduled to be arraigned Sept. 29 in Department F of the Los Angeles County Superior Court, Pomona Branch. Prosecutors asked bail be set at $1.02 million.

On Sept. 7, Rivera was reportedly staying the night in her mother’s room at a senior living center in the 800 block of West San Bernardino Road in Covina, prosecutors said.

During the middle of the night, the defendant allegedly awoke and stabbed her mother, Margaret Machiko Yamaguchi, several times, prosecutors said.

During the attack, an emergency call was made from the room. When the facility staff entered the room, they discovered Yamaguchi lying on the floor, bleeding and unresponsive. Authorities were called and the victim was pronounced dead at the scene.

Rivera was subsequently arrested in connection with the fatal stabbing.

If convicted as charged, the defendant faces a possible maximum sentence of 26 years to life in state prison.

The case is being investigated by the Covina Police Department.

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