Our loving father, Donald Theodore Smaistrla, 79, passed away on November 29, 2020. He was born on July 14, 1941 in East Bernard, Texas. He fought a long, hard battle with cancer, but he was determined to live life to the fullest. Just like he dealt with all experiences in life, Don managed his illness with strength and grace. His optimistic outlook on life kept him going despite many setbacks. Don attended school in East Bernard, Texas. Upon leaving school, he enlisted in the Army and served a great deal of time in Germany. He then attended Oklahoma State University, graduating with an Associates Degree in Police Science and served 20 years as a police officer with the Oklahoma City Police Department. After retiring, he started his own business, Smaistrla Security Services, installing alarms in the community. Donald had a service driven personality. He would always place his own plans aside if he knew others needed assistance. Donald was a spiritual and devoted member of the Windsor Hills Baptist Church / Higher Plain Baptist Church. He spent several years teaching Sunday school, providing transportation for youth, and volunteered security services for the church. He will always be known as a devout Christian who lived his life serving the Lord. He is survived by his daughter, Laura Winter (Joseph) of Wayne, OK; son, John Smaistrla (Jill) of Henderson, NV; son-in-law, Steve Parker of Yukon, OK; grandchildren, Timothy, Courtney, Renee, Rebecca, Joshua, Brody, Barrett, and Blakely. He also had several great grandchildren. He was preceded in death by his parents, one brother, and his beloved daughter Debbie Parker. Viewing will be on December 18, 2020, 9am 9pm at Mercer-Adams Funeral Service, 3925 N. Asbury, Bethany, OK. The funeral service will be held on December 19, 2020, 11:00am, at Higher Plain Baptist Church, 6810 NW 122 St., Oklahoma City, OK. The interment will take place in Frisco Cemetery, 14200 W. Britton Rd., Yukon, OK immediately following the service. . Viewing Mercer-Adams Funeral Service Friday, December 18, 2020 9:00 AM - 9:00 PM 3925 North Asbury Avenue Bethany, Oklahoma 73008 Funeral Service Higher Plain Baptist Church Saturday, December 19, 2020 11:00 AM 6810 NW 122 Oklahoma City, OK 73142