Donnie, 59, of Thornton, Colorado passed away March 22, 2014 with family near his side. Donnie was proud to serve his country in the United States Marine Corps from 1971-1975. He was employed as a locomotive engineer for Burlington Northern Santa Fe Railroad for 37 1/2 years. In his spare time, Donnie could be found on the lake, reeling in a large walleye, bass or northern pike worth keeping. Survived by his loving wife, Mary Ann; cherished twin daughters, Courtney and Brianna; mother, Wanda; three sisters, one brother and their families; many nieces, nephews, cousins, friends and co-workers. Preceded in death by his father, Donald E. Graf. The family will receive friends during visitation on Wednesday, March 26, 2014, 5:00 - 8:00 PM, Horan & McConaty Family Chapel, 9998 Grant Street, Thornton, Colorado. Funeral Mass will be celebrated Thursday, March 27, 2014, 2:00 PM, at Immaculate Heart of Mary Catholic Church, 11385 Grant Drive, Northglenn, Colorado. Committal Service with military honors will be Friday, March 28, 2014, 10:30 AM, Fort Logan National Cemetery, Area ""B"", 3698 South Sheridan Boulevard, Denver, Colorado. In lieu of flowers, memorials in Donald's name may be made to any of the following organizations: *Immaculate Heart of Mary Catholic Church 11385 Grant Drive, Northglenn, Colorado 80233 *Lung Cancer Colorado Fund University of Colorado Hospital Foundation Mail Stop F485 12401 East 17th Avenue Aurora, CO 80045 Please make checks payable to the Lung Cancer Colorado Fund and please be sure to write ""UCH Foundation"" on the memo line. Please share your memories of Donnie and condolences with his family by signing the guestbook below.