Marvin R. Walker, 74, 155 Fairview Lane, died Monday at his residence.  He was retired from the Clarksville Gas & Water Department and was a member of Cumberland Drive Baptist Church.  The funeral will be held at 2 p.m. Wednesday at Tarpley’s Chapel with the Rev. James Swafford officiating.  Burial will be in Smith Cemetery, Big Rock.  Visitation will be after noon today at Tarpley’s Chapel.  Walker was born Dec. 26, 1909, Big Rock, the son of Martin and Tinne Selph Walker.  Survivors include his wife, Carlene Simpson Walker; two daughters, Betty Byron and Clara Christopher, both of Clarksville; a brother George Edward Walker, Wilmington, IL; and three sisters, Ethel James, Emma Dee Lehman and Blanch Newman, all of Clarksville.