Authorities say 19-year-old Ackel Arriaza killed his mother, 46-year-old Dora Villatoro-Arriaza, around 6 a.m. Sunday in front of their home on Adams Avenue in Brentwood.
They say the two got into an argument while sitting in their car.
Investigators say Villatoro-Arriaza's husband and three other children were inside the home at the time of the stabbing. They were not injured.
Ackel Arriaza is charged with second-degree murder.
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