Marvin Callahan, 89, of Fort Worth, formerly of Big Spring, passed away Friday, July 3, 2020. Graveside services will be 2:00 PM Thursday, July 9, 2020 at Trinity Memorial Park.He was born June 15, 1931 in Medora, Indiana and married Maurietta Ramey January 5, 1952 in Hereford, Texas. She preceded him in death September 20, 2015.Marvin served in the United States Air Force from 1950 to 1954. He worked for Clyde McMahon Concrete for 36 years, retiring as office manager.He was a member of Midway Baptist Church and was a former member of AMBUCS.Survivors include his son, Robert Mark Callahan of Fort Worth; one sister, Irma Lee Stout of Florida; one brother, Tom Callahan of Medora, Indiana; and several nieces and nephews.He was also preceded in death by his parents; and one sister, Sharon Callahan.(If you want to suggests memorials donations that would go here).Arrangements are under the direction of Nalley-Pickle & Welch Funeral Home and Crematory. Online condolences can be made at www.npwelch.com,