Timothy (Tim) Joseph Theisen, Sr., 80, passed away on January 27, 2021. Tim was a resident of St. Tammany Parish and was married for 56 years to Beverly LeBlanc Theisen. Tim was the proud father to his children Timothy Joseph Theisen, Jr. (wife Dawn), Tiffany Theisen Kubik and Melissa Ann Farmer (dec). Tim had 5 beautiful grandchildren, Christopher R. Olivero, Kaitlyn M. Oliver, Blake J. Theisen, William (Billy) J. Farmer, III, Bailey E. Theisen and 3 great grandchildren, Brayden R. Olivero, Parker R. Olivero and Madison A. Oliver. Tim is preceded in death by his parents, Alvin Joseph Theisen and Zulma Pichon Knoll and sister Cherlyn Theisen Matthew (husband Arthur) and survived by brother, Lynn Paul Dominique, II. Tim was a Veteran of the U.S. Army from May 1963 to May 1965. Tim was an Artillery Specialist in Headquarter Battery, 4th Missile Battalion, 62nd Artillery with awards of Expert – Rifle, Certificate of Achievement and Good Conduct Medal. For 44 years, Tim was a proud member of the Plumbers and Steamfitters Local Union No. 60. He will be deeply missed by all who knew and loved him. Family and friends are invited to attend the Memorial Service at Trinity Church, 19380 N. 10th St., Covington, LA 70433 on February 13, 2021 at 11:00 am. The family requests those who wish to express sympathy in lieu of flowers to consider making a donation to their favorite charity in Timothy Joseph Theisen’s name.