Of all the pain and struggles that are left in the aftermath of a murder, it may be the senselessness that haunts us the most. On February 9th, 2010, 17-year-old Mackenzie Cowell said she’d only be gone for 15 minutes when she left the Academy of Hair Design in Wenatchee, Washington. Four days later, police discovered Mackenzie dead and mutilated along the banks of the Columbia River. She still wore her beauty school uniform.