Eyewitness News has learned the suspect, who has been booked on two counts of murder, is the woman's son. Officials say they do not believe there remains any immediate threat to others in the neighborhood.
Authorities say the incident was reported by a woman who was on a Zoom call with the woman who lived at the home and saw what appeared to be a man being kidnapped at the home. She called 911.
The Los Angeles County Sheriff's Department was dispatched to the 3100 block of North Marengo Avenue around 2:45 p.m.
They found a man in his 60s dead in the driveway. When they checked inside the house, they found a woman in her 60s dead there.
Friends say the victims are brother and sister and say it may have been a case of family violence.
As deputies were investigating the scene, a man initially considered a person of interest drove up in the victims' car and said he lived at the home. Deputies detained him.
Authorities later arrested the suspect, identified as 32-year-old Robert Cotton.