Bill and Cathy Guthrie, Shawnee, have announced the engagement of their daughter, Devon, Shawnee, to Marty McDermott, Omaha, Neb.He is the son of Larry and Margie McDermott, Omaha, Neb.Her grandparents are Art and Vera Allan, Ottawa, and Bill and Beverly Guthrie, Shawnee.She graduated from Oklahoma Baptist University, Shawnee, Okla. She works as an office manager at Infant Toddler Services of Johnson County.He graduated from Grace University, Omaha, Neb. He works as an assistant manager at Toys R Us, Omaha, Neb.The wedding is scheduled for August at Olathe.