Newly-released footage shows the chilling moment a honors student confessed to brutally stabbing and killing his mother despite pleading not guilty. Earlier this month, Derek Rosa, 13, pleaded not guilty to stabbing his mom Irina Garcia, 39, over 40 times and on October 12. No motive has been offered over the grisly killing. But in a newly obtained police interrogation video, the teen is seen describing the size and color of the knife he used to commit the heinous .
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