MacKenzie was born August 31, 2017 in Springfield, Missouri, the daughter of Dewayne Allen Tennison and Marcie Montelongo.
Surviving are her father, Dewayne Allen Tennison, Branson, Missouri; paternal grandmother, Karla McNeely and her husband Charlie, Clinton, MO; and paternal grandfather, Jim Tennison, Bolivar, Mo.
Memorial services will be at 2:00 p.m. Saturday, November 23, 2019 at the Bradley & Hadley Funeral Home, Clinton.