College student, 21, shot dead parents and sister, before killing himself

 What could have prompted such a promising young man to kill his entire family? A 21-year-old man is believed to have shot dead his parents and teen sister in a bloody memorial day murder-suicide, but the motive for the attack remains a mystery.

Michael Sheer killed his parents Mark and Lydia Sheer, 55 and 54, as well as his 15-year-old sister Amy Sheer, according to a statement from the Orange County Sheriff's Department.

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