Boy, 16, admits murdering his cousin, 21, after trying to rape her and writing 'my bad' in blood on the wall weeks before she was due to marry

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Joshua Keyzer (center), 16, pleaded guilty to felony murder and attempted criminal sexual conduct targeting Kassandra Keyzer (pictured right with her grandmother and left with her fiance), a Michigan college student and young mother, who was killed last June. The 21-year-old bride-to-be was discovered partially nude and covered in blood in her grandmother's basement in Michigan June 25, 2014. Sharon Keyzer (pictured), 67, suffered a laceration to her throat but survived.