Diane Elizabeth Nichols Mueller, age 81 of Seguin, passed away peacefully surrounded by her family and friends on March 8, 2018. Visitation will be held on Monday, March 12, 2018 at Tres Hewell Mortuary from 5 to 7 p.m. Funeral services will be held on Tuesday, March 13, 2018 at Tres Hewell Mortuary Chapel at 3 p.m. with Rev. Jeremy Roy officiating. Interment will follow in San Geronimo Cemetery. Diane was born October 21, 1936 in Watertown, New York to Robert and Lillian (Keegan) Nichols. She met and married her husband Melvin A. "Sonny" Mueller in Florida. Diane loved Florida, especially trips to the beach and Disney World. Weekly family dinner gatherings on Tuesday Evenings at the house were always special to Diane. She is preceded in death by her loving husband of 54 years, Melvin A. "Sonny" Mueller and her parents and brother-in-law, Ray Mueller. She is survived by her children, Katharine Howard and husband Mark, Mike Mueller and wife Carrie, David Mueller and wife Emily; grandchildren who knew her as "Oma", Mason and Jeff Mueller, Logan and Noah Howard, and Douglas Mueller; brother, Ronald Nichols and wife Terry; brothers-in-law, Donald Mueller, and Kenneth Mueller and wife Linda; sister-in-law, Katherine "Sissy" Hatfield and husband Robert; her beloved cat, Annabelle; numerous nieces, nephews, cousins, other loving family members and many friends. Memorial contributions may be made to the Guadalupe County Humane Society, P. O.Box 1593, Seguin, Texas, 78155-1593 or to the charity of one's choice.