Diaz, Mary 7/8/1966 - 10/15/2020 Otsego, MI Mary Beth Diaz (Null) age 54 of Otsego, MI passed away Thursday October 15th at Bronson Methodist hospital in Kalamazoo after a long battle with many health problems. Born July 8th 1966 to David and Nancy Null in Follansbee West Virginia. Mary graduated from Brooke high school in Wellsburg West Virginia. After graduation she moved to Michigan, where she met her husband Daniel and raised her children Christopher and Jessica. Along the way she worked with developmentally disabled adults and touched the lives of so many. Preceded in death by father David Null, mother Nancy Null (Fisher). Survived by husband Daniel Diaz, sister Rebecca Null, son Christopher Diaz, and daughter Jessica Diaz. There will be a celebration of life at the Otsego Moose Lodge, Friday October 30th from 2:00-4:30.