On July 19, 2011, 6-year-old Lauren was stabbed over 20 times by her mother’s boyfriend, David, with her twin sister a short distance away. Lauren did not survive.

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“I woke up to the sounds of my daughters screaming,” says the girls’ mother, Allison, describing the morning her child was killed. In the video above, Allison details her struggle with David, before – and after–he fatally wounded Lauren.

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Although he was charged with second-degree homicide, a judge ruled David was not responsible for Lauren's death “by reason of mental disease or defect.” He was accordingly sent to a mental hospital.

It’s been over five years since Lauren was killed, and Allison says dealing with her child’s death isn’t any easier. “I cry every day, but not in public. Not around people.”

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Tune in to Friday’s Dr. Phil to learn how Lauren’s surviving family members are coping with the aftermath of her death.

WATCH: A Grieving Brother’s Life After His Little Sister’s Senseless Death

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'I Hope They Don’t Lose Hope,' Says Mom Of Her Two Surviving Children Learning To Cope With Their Sister’s Violent Death