Mackenzie Nicole Cowell (April 1, 1992 – February 9, 2010) was a 17-year-old American youth who went missing and was murdered in February 2010. She was last seen at the beauty school she attended in Wenatchee, Washington. Her body was discovered on the banks of the Columbia River four days later on February 13, 2010. A post-mortem examination determined she had been strangled, stabbed in the neck, and had suffered blunt force trauma to the head.