Amanda Marissa

De La O McCauley

Amanda "Mandy" Marissa De La O McCauley, 42, of Sioux City, passed away Saturday, September 26, 2026. A visitation will be from 2:00- 8:00 P.M Sunday, October 4, 2026, with a Rosary at 5:00 P.M. at Mohr & Becker - Hunt in South Sioux City. A Funeral Mass will be 10:30 A.M. Monday, October 5, 2026, at St. Michael's Catholic Church in South Sioux City. Burial at St. Michael's Cemetery. 

Amanda was born in Sioux City, Iowa, to Yolanda (Guerra) and Raul De La O on November 5, 1983, the youngest of four children.

She attended West High School in Sioux City, continued her education at Western Iowa Tech Community College, and graduated in 2011. Pursuing her love of dentistry, she became a valued member of the team at Lilly Family Dentistry, where she worked for many years. She formed many meaningful connections with both her coworkers and the families she served.

Amanda’s greatest joy and most cherished role was that of a mother. She welcomed her son in 2013 and her daughter in 2018. Her children were the most important part of her life, and she devoted herself wholeheartedly to them.

She loved life deeply. She loved her family, friends, work, music, dancing, and singing. She enjoyed watching movies and was fond of quoting her favorites, bringing humor and laughter into everyday moments. She was a fiercely loyal and caring daughter, sister, aunt, cousin, and friend.

Amanda’s warmth, laughter, kindness, and playful spirit touched countless lives. She will be deeply missed and forever loved. Her memory, strength, and loyalty will live on in the hearts of those who knew her, especially in the lives of her children.

Amanda is survived by her children, Alexander McCauley and Aliva McCauley; sisters, Ana Marisela (Dayton) McNeil and Alicia (Cesar) Tello; brother, Hector (Tracy) De La O; and her nieces and nephews, Ricardo Quintanilla, Monique (Dominic) Ibañez, Mia Tello, Alyssa Tello, Reuben (Natasha) De La O, Yesenia De La O, Juliana De La O, Xavier De La O, Arabella De La O, and Gabriela De La O. She is also survived by her grandmothers, Maria “Cuca” (De Los Angeles) De La O and Gladys (Perez) Guerra. Amanda had many aunts, uncles, and cousins, near and far, who were blessed to have known her.

Amanda was preceded in death by her mother, Yolanda Guerra Koon; grandfathers, Jose L. Guerra and Manuel “Meme” De La O; grandmother, Margarita Guerra; uncle, Jose L. Guerra, Jr.; aunts, Rosalinda Guerra and Tomasa Salas; and cousin, Evita Salas.