Prosecutors say 24-year-old Deandre Foster shot and killed 21-year-old Charlotte Ethridge following a domestic dispute at an apartment complex in 2021.
Foster then turned the gun on Ethridge's foster mother, 50-year-old Michelle Johnson.
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He has an extensive criminal history dating back to 2009 and had two prior strike convictions for robbery from 2013 to 2017.
Foster was handed down a sentence of 200 years to life in prison.