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Woman sentenced for stabbing mother to death at Covina senior home

A woman was sentenced Feb. 2 to 16 years to life in state prison for the stabbing death of her mother at a senior living facility in Covina, according to the Los Angeles County district attorney’s office. 

Athina Sumi Rivera, 43, pleaded guilty to one count of second-degree murder for killing Margaret Machicko Yamaguchi, 61.

Prosecutors said Rivera was staying in her mother’s room at a senior living center in Covina. 

On Sept. 7, 2015, Rivera woke up in the middle of the night and stabbed her mother several times, prosecutors said. During the attack, an emergency call was made from the room. When facility staffers entered the room, they discovered Yamaguchi bleeding heavily. 

Authorities were called, and Yamaguchi was pronounced dead at the scene. Rivera was subsequently arrested. 

Contact the Homicide Report. Follow @jeromercampbell and @latimeshomicide on Twitter.

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