Garden Grove Police say they found the victim, identified as Vivian Wolff, in a bedroom Tuesday at the apartment she rented on Flower Street.
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Detectives say her son, 28-year-old Jonathan Michael Warner, was last seen Friday.
Police say the woman lived with her son and are considering him a person of interest.
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Investigators say they want to question Warner to make sure he and other relatives are safe.
The case is being investigated as a homicide.