Shocking new doorbell surveillance footage has revealed the chilling final interactions between a mother and son - before he confessed to brutally stabbing her to death next to her newborn baby girl. Derek Rosa, 13, is initially seen calmly chatting with his mom, Irina Garcia, 39, in their living room as she cradled her baby, asking her in Spanish: 'Why do you always tell me, 'Don't run?''Hours later, Rosa was captured by the same doorbell camera after his mom's slaying, calmly asking a 911 dispatcher: 'I see officers, do I leave? Do I leave my house?'
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